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#include <iostream>
#include <bits/stdc++.h>
using namespace std;
 
int main() {
	string s;
	cin>>s;
	int i,l=0,p;
	int n=s.size();
	sort(s,s+n);
	for(i=0;i<n;i++)
	{
		if(s[i]>='a'&& s[i]<='z')
		{    p++;
 
			if(s[i]==s[i+1])
			{
				p--;
			}
		}
	}
	cout<<p;
	// your code goes here
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:10:10: error: no match for ‘operator+’ (operand types are ‘std::__cxx11::string’ {aka ‘std::__cxx11::basic_string<char>’} and ‘int’)
  sort(s,s+n);
         ~^~
In file included from /usr/include/c++/8/bits/stl_algobase.h:67,
                 from /usr/include/c++/8/bits/char_traits.h:39,
                 from /usr/include/c++/8/ios:40,
                 from /usr/include/c++/8/ostream:38,
                 from /usr/include/c++/8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/8/bits/stl_iterator.h:400:5: note: candidate: ‘template<class _Iterator> std::reverse_iterator<_Iterator> std::operator+(typename std::reverse_iterator<_Iterator>::difference_type, const std::reverse_iterator<_Iterator>&)’
     operator+(typename reverse_iterator<_Iterator>::difference_type __n,
     ^~~~~~~~
/usr/include/c++/8/bits/stl_iterator.h:400:5: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   mismatched types ‘const std::reverse_iterator<_Iterator>’ and ‘int’
  sort(s,s+n);
           ^
In file included from /usr/include/c++/8/bits/stl_algobase.h:67,
                 from /usr/include/c++/8/bits/char_traits.h:39,
                 from /usr/include/c++/8/ios:40,
                 from /usr/include/c++/8/ostream:38,
                 from /usr/include/c++/8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/8/bits/stl_iterator.h:1195:5: note: candidate: ‘template<class _Iterator> std::move_iterator<_IteratorL> std::operator+(typename std::move_iterator<_IteratorL>::difference_type, const std::move_iterator<_IteratorL>&)’
     operator+(typename move_iterator<_Iterator>::difference_type __n,
     ^~~~~~~~
/usr/include/c++/8/bits/stl_iterator.h:1195:5: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   mismatched types ‘const std::move_iterator<_IteratorL>’ and ‘int’
  sort(s,s+n);
           ^
In file included from /usr/include/c++/8/string:52,
                 from /usr/include/c++/8/bits/locale_classes.h:40,
                 from /usr/include/c++/8/bits/ios_base.h:41,
                 from /usr/include/c++/8/ios:42,
                 from /usr/include/c++/8/ostream:38,
                 from /usr/include/c++/8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/8/bits/basic_string.h:5927:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)’
     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^~~~~~~~
/usr/include/c++/8/bits/basic_string.h:5927:5: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   mismatched types ‘const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’ and ‘int’
  sort(s,s+n);
           ^
In file included from /usr/include/c++/8/string:53,
                 from /usr/include/c++/8/bits/locale_classes.h:40,
                 from /usr/include/c++/8/bits/ios_base.h:41,
                 from /usr/include/c++/8/ios:42,
                 from /usr/include/c++/8/ostream:38,
                 from /usr/include/c++/8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/8/bits/basic_string.tcc:1157:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(const _CharT*, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)’
     operator+(const _CharT* __lhs,
     ^~~~~~~~
/usr/include/c++/8/bits/basic_string.tcc:1157:5: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   mismatched types ‘const _CharT*’ and ‘std::__cxx11::basic_string<char>’
  sort(s,s+n);
           ^
In file included from /usr/include/c++/8/string:53,
                 from /usr/include/c++/8/bits/locale_classes.h:40,
                 from /usr/include/c++/8/bits/ios_base.h:41,
                 from /usr/include/c++/8/ios:42,
                 from /usr/include/c++/8/ostream:38,
                 from /usr/include/c++/8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/8/bits/basic_string.tcc:1173:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(_CharT, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)’
     operator+(_CharT __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs)
     ^~~~~~~~
/usr/include/c++/8/bits/basic_string.tcc:1173:5: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   mismatched types ‘const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’ and ‘int’
  sort(s,s+n);
           ^
In file included from /usr/include/c++/8/string:52,
                 from /usr/include/c++/8/bits/locale_classes.h:40,
                 from /usr/include/c++/8/bits/ios_base.h:41,
                 from /usr/include/c++/8/ios:42,
                 from /usr/include/c++/8/ostream:38,
                 from /usr/include/c++/8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/8/bits/basic_string.h:5964:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)’
     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^~~~~~~~
/usr/include/c++/8/bits/basic_string.h:5964:5: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   mismatched types ‘const _CharT*’ and ‘int’
  sort(s,s+n);
           ^
In file included from /usr/include/c++/8/string:52,
                 from /usr/include/c++/8/bits/locale_classes.h:40,
                 from /usr/include/c++/8/bits/ios_base.h:41,
                 from /usr/include/c++/8/ios:42,
                 from /usr/include/c++/8/ostream:38,
                 from /usr/include/c++/8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/8/bits/basic_string.h:5980:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, _CharT)’
     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs, _CharT __rhs)
     ^~~~~~~~
/usr/include/c++/8/bits/basic_string.h:5980:5: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   deduced conflicting types for parameter ‘_CharT’ (‘char’ and ‘int’)
  sort(s,s+n);
           ^
In file included from /usr/include/c++/8/string:52,
                 from /usr/include/c++/8/bits/locale_classes.h:40,
                 from /usr/include/c++/8/bits/ios_base.h:41,
                 from /usr/include/c++/8/ios:42,
                 from /usr/include/c++/8/ostream:38,
                 from /usr/include/c++/8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/8/bits/basic_string.h:5992:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)’
     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
     ^~~~~~~~
/usr/include/c++/8/bits/basic_string.h:5992:5: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   mismatched types ‘const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’ and ‘int’
  sort(s,s+n);
           ^
In file included from /usr/include/c++/8/string:52,
                 from /usr/include/c++/8/bits/locale_classes.h:40,
                 from /usr/include/c++/8/bits/ios_base.h:41,
                 from /usr/include/c++/8/ios:42,
                 from /usr/include/c++/8/ostream:38,
                 from /usr/include/c++/8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/8/bits/basic_string.h:5998:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&)’
     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^~~~~~~~
/usr/include/c++/8/bits/basic_string.h:5998:5: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   mismatched types ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’ and ‘int’
  sort(s,s+n);
           ^
In file included from /usr/include/c++/8/string:52,
                 from /usr/include/c++/8/bits/locale_classes.h:40,
                 from /usr/include/c++/8/bits/ios_base.h:41,
                 from /usr/include/c++/8/ios:42,
                 from /usr/include/c++/8/ostream:38,
                 from /usr/include/c++/8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/8/bits/basic_string.h:6004:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&)’
     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
     ^~~~~~~~
/usr/include/c++/8/bits/basic_string.h:6004:5: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   mismatched types ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’ and ‘int’
  sort(s,s+n);
           ^
In file included from /usr/include/c++/8/string:52,
                 from /usr/include/c++/8/bits/locale_classes.h:40,
                 from /usr/include/c++/8/bits/ios_base.h:41,
                 from /usr/include/c++/8/ios:42,
                 from /usr/include/c++/8/ostream:38,
                 from /usr/include/c++/8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/8/bits/basic_string.h:6016:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(const _CharT*, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&)’
     operator+(const _CharT* __lhs,
     ^~~~~~~~
/usr/include/c++/8/bits/basic_string.h:6016:5: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   mismatched types ‘const _CharT*’ and ‘std::__cxx11::basic_string<char>’
  sort(s,s+n);
           ^
In file included from /usr/include/c++/8/string:52,
                 from /usr/include/c++/8/bits/locale_classes.h:40,
                 from /usr/include/c++/8/bits/ios_base.h:41,
                 from /usr/include/c++/8/ios:42,
                 from /usr/include/c++/8/ostream:38,
                 from /usr/include/c++/8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/8/bits/basic_string.h:6022:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(_CharT, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&)’
     operator+(_CharT __lhs,
     ^~~~~~~~
/usr/include/c++/8/bits/basic_string.h:6022:5: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   mismatched types ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>’ and ‘int’
  sort(s,s+n);
           ^
In file included from /usr/include/c++/8/string:52,
                 from /usr/include/c++/8/bits/locale_classes.h:40,
                 from /usr/include/c++/8/bits/ios_base.h:41,
                 from /usr/include/c++/8/ios:42,
                 from /usr/include/c++/8/ostream:38,
                 from /usr/include/c++/8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/8/bits/basic_string.h:6028:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, const _CharT*)’
     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
     ^~~~~~~~
/usr/include/c++/8/bits/basic_string.h:6028:5: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   mismatched types ‘const _CharT*’ and ‘int’
  sort(s,s+n);
           ^
In file included from /usr/include/c++/8/string:52,
                 from /usr/include/c++/8/bits/locale_classes.h:40,
                 from /usr/include/c++/8/bits/ios_base.h:41,
                 from /usr/include/c++/8/ios:42,
                 from /usr/include/c++/8/ostream:38,
                 from /usr/include/c++/8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/8/bits/basic_string.h:6034:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Alloc> std::operator+(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, _CharT)’
     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
     ^~~~~~~~
/usr/include/c++/8/bits/basic_string.h:6034:5: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   deduced conflicting types for parameter ‘_CharT’ (‘char’ and ‘int’)
  sort(s,s+n);
           ^
In file included from /usr/include/c++/8/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/8/bits/stdc++.h:52,
                 from prog.cpp:2:
/usr/include/c++/8/complex:326:5: note: candidate: ‘template<class _Tp> std::complex<_Tp> std::operator+(const std::complex<_Tp>&, const std::complex<_Tp>&)’
     operator+(const complex<_Tp>& __x, const complex<_Tp>& __y)
     ^~~~~~~~
/usr/include/c++/8/complex:326:5: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   ‘std::__cxx11::string’ {aka ‘std::__cxx11::basic_string<char>’} is not derived from ‘const std::complex<_Tp>’
  sort(s,s+n);
           ^
In file included from /usr/include/c++/8/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/8/bits/stdc++.h:52,
                 from prog.cpp:2:
/usr/include/c++/8/complex:335:5: note: candidate: ‘template<class _Tp> std::complex<_Tp> std::operator+(const std::complex<_Tp>&, const _Tp&)’
     operator+(const complex<_Tp>& __x, const _Tp& __y)
     ^~~~~~~~
/usr/include/c++/8/complex:335:5: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   ‘std::__cxx11::string’ {aka ‘std::__cxx11::basic_string<char>’} is not derived from ‘const std::complex<_Tp>’
  sort(s,s+n);
           ^
In file included from /usr/include/c++/8/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/8/bits/stdc++.h:52,
                 from prog.cpp:2:
/usr/include/c++/8/complex:344:5: note: candidate: ‘template<class _Tp> std::complex<_Tp> std::operator+(const _Tp&, const std::complex<_Tp>&)’
     operator+(const _Tp& __x, const complex<_Tp>& __y)
     ^~~~~~~~
/usr/include/c++/8/complex:344:5: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   mismatched types ‘const std::complex<_Tp>’ and ‘int’
  sort(s,s+n);
           ^
In file included from /usr/include/c++/8/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/8/bits/stdc++.h:52,
                 from prog.cpp:2:
/usr/include/c++/8/complex:445:5: note: candidate: ‘template<class _Tp> std::complex<_Tp> std::operator+(const std::complex<_Tp>&)’
     operator+(const complex<_Tp>& __x)
     ^~~~~~~~
/usr/include/c++/8/complex:445:5: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   ‘std::__cxx11::string’ {aka ‘std::__cxx11::basic_string<char>’} is not derived from ‘const std::complex<_Tp>’
  sort(s,s+n);
           ^
In file included from /usr/include/c++/8/deque:64,
                 from /usr/include/x86_64-linux-gnu/c++/8/bits/stdc++.h:68,
                 from prog.cpp:2:
/usr/include/c++/8/bits/stl_deque.h:375:5: note: candidate: ‘template<class _Tp, class _Ref, class _Ptr> std::_Deque_iterator<_Tp, _Ref, _Ptr> std::operator+(std::ptrdiff_t, const std::_Deque_iterator<_Tp, _Ref, _Ptr>&)’
     operator+(ptrdiff_t __n, const _Deque_iterator<_Tp, _Ref, _Ptr>& __x)
     ^~~~~~~~
/usr/include/c++/8/bits/stl_deque.h:375:5: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   mismatched types ‘const std::_Deque_iterator<_Tp, _Ref, _Ptr>’ and ‘int’
  sort(s,s+n);
           ^
In file included from /usr/include/c++/8/vector:65,
                 from /usr/include/c++/8/queue:61,
                 from /usr/include/x86_64-linux-gnu/c++/8/bits/stdc++.h:86,
                 from prog.cpp:2:
/usr/include/c++/8/bits/stl_bvector.h:299:3: note: candidate: ‘std::_Bit_iterator std::operator+(std::ptrdiff_t, const std::_Bit_iterator&)’
   operator+(ptrdiff_t __n, const _Bit_iterator& __x)
   ^~~~~~~~
/usr/include/c++/8/bits/stl_bvector.h:299:3: note:   no known conversion for argument 1 from ‘std::__cxx11::string’ {aka ‘std::__cxx11::basic_string<char>’} to ‘std::ptrdiff_t’ {aka ‘long int’}
/usr/include/c++/8/bits/stl_bvector.h:389:3: note: candidate: ‘std::_Bit_const_iterator std::operator+(std::ptrdiff_t, const std::_Bit_const_iterator&)’
   operator+(ptrdiff_t __n, const _Bit_const_iterator& __x)
   ^~~~~~~~
/usr/include/c++/8/bits/stl_bvector.h:389:3: note:   no known conversion for argument 1 from ‘std::__cxx11::string’ {aka ‘std::__cxx11::basic_string<char>’} to ‘std::ptrdiff_t’ {aka ‘long int’}
In file included from /usr/include/c++/8/valarray:592,
                 from /usr/include/x86_64-linux-gnu/c++/8/bits/stdc++.h:95,
                 from prog.cpp:2:
/usr/include/c++/8/bits/valarray_after.h:402:5: note: candidate: ‘template<class _Dom1, class _Dom2> std::_Expr<std::_BinClos<std::__plus, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__plus, typename _Dom1::value_type>::result_type> std::operator+(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const std::_Expr<_Dom2, typename _Dom2::value_type>&)’
     _DEFINE_EXPR_BINARY_OPERATOR(+, __plus)
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/8/bits/valarray_after.h:402:5: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   ‘std::__cxx11::string’ {aka ‘std::__cxx11::basic_string<char>’} is not derived from ‘const std::_Expr<_Dom1, typename _Dom1::value_type>’
  sort(s,s+n);
           ^
In file included from /usr/include/c++/8/valarray:592,
                 from /usr/include/x86_64-linux-gnu/c++/8/bits/stdc++.h:95,
                 from prog.cpp:2:
/usr/include/c++/8/bits/valarray_after.h:402:5: note: candidate: ‘template<class _Dom> std::_Expr<std::_BinClos<std::__plus, std::_Expr, std::_Constant, _Dom, typename _Dom::value_type>, typename std::__fun<std::__plus, typename _Dom1::value_type>::result_type> std::operator+(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)’
     _DEFINE_EXPR_BINARY_OPERATOR(+, __plus)
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/8/bits/valarray_after.h:402:5: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   ‘std::__cxx11::string’ {aka ‘std::__cxx11::basic_string<char>’} is not derived from ‘const std::_Expr<_Dom1, typename _Dom1::value_type>’
  sort(s,s+n);
           ^
In file included from /usr/include/c++/8/valarray:592,
                 from /usr/include/x86_64-linux-gnu/c++/8/bits/stdc++.h:95,
                 from prog.cpp:2:
/usr/include/c++/8/bits/valarray_after.h:402:5: note: candidate: ‘template<class _Dom> std::_Expr<std::_BinClos<std::__plus, std::_Constant, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__plus, typename _Dom1::value_type>::result_type> std::operator+(const typename _Dom::value_type&, const std::_Expr<_Dom1, typename _Dom1::value_type>&)’
     _DEFINE_EXPR_BINARY_OPERATOR(+, __plus)
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/8/bits/valarray_after.h:402:5: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   mismatched types ‘const std::_Expr<_Dom1, typename _Dom1::value_type>’ and ‘int’
  sort(s,s+n);
           ^
In file included from /usr/include/c++/8/valarray:592,
                 from /usr/include/x86_64-linux-gnu/c++/8/bits/stdc++.h:95,
                 from prog.cpp:2:
/usr/include/c++/8/bits/valarray_after.h:402:5: note: candidate: ‘template<class _Dom> std::_Expr<std::_BinClos<std::__plus, std::_Expr, std::_ValArray, _Dom, typename _Dom::value_type>, typename std::__fun<std::__plus, typename _Dom1::value_type>::result_type> std::operator+(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const std::valarray<typename _Dom::value_type>&)’
     _DEFINE_EXPR_BINARY_OPERATOR(+, __plus)
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/8/bits/valarray_after.h:402:5: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   ‘std::__cxx11::string’ {aka ‘std::__cxx11::basic_string<char>’} is not derived from ‘const std::_Expr<_Dom1, typename _Dom1::value_type>’
  sort(s,s+n);
           ^
In file included from /usr/include/c++/8/valarray:592,
                 from /usr/include/x86_64-linux-gnu/c++/8/bits/stdc++.h:95,
                 from prog.cpp:2:
/usr/include/c++/8/bits/valarray_after.h:402:5: note: candidate: ‘template<class _Dom> std::_Expr<std::_BinClos<std::__plus, std::_ValArray, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__plus, typename _Dom1::value_type>::result_type> std::operator+(const std::valarray<typename _Dom::value_type>&, const std::_Expr<_Dom1, typename _Dom1::value_type>&)’
     _DEFINE_EXPR_BINARY_OPERATOR(+, __plus)
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/8/bits/valarray_after.h:402:5: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   mismatched types ‘const std::_Expr<_Dom1, typename _Dom1::value_type>’ and ‘int’
  sort(s,s+n);
           ^
In file included from /usr/include/x86_64-linux-gnu/c++/8/bits/stdc++.h:95,
                 from prog.cpp:2:
/usr/include/c++/8/valarray:1172:1: note: candidate: ‘template<class _Tp> std::_Expr<std::_BinClos<std::__plus, std::_ValArray, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__plus, _Tp>::result_type> std::operator+(const std::valarray<_Tp>&, const std::valarray<_Tp>&)’
 _DEFINE_BINARY_OPERATOR(+, __plus)
 ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/8/valarray:1172:1: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   ‘std::__cxx11::string’ {aka ‘std::__cxx11::basic_string<char>’} is not derived from ‘const std::valarray<_Tp>’
  sort(s,s+n);
           ^
In file included from /usr/include/x86_64-linux-gnu/c++/8/bits/stdc++.h:95,
                 from prog.cpp:2:
/usr/include/c++/8/valarray:1172:1: note: candidate: ‘template<class _Tp> std::_Expr<std::_BinClos<std::__plus, std::_ValArray, std::_Constant, _Tp, _Tp>, typename std::__fun<std::__plus, _Tp>::result_type> std::operator+(const std::valarray<_Tp>&, const _Tp&)’
 _DEFINE_BINARY_OPERATOR(+, __plus)
 ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/8/valarray:1172:1: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   ‘std::__cxx11::string’ {aka ‘std::__cxx11::basic_string<char>’} is not derived from ‘const std::valarray<_Tp>’
  sort(s,s+n);
           ^
In file included from /usr/include/x86_64-linux-gnu/c++/8/bits/stdc++.h:95,
                 from prog.cpp:2:
/usr/include/c++/8/valarray:1172:1: note: candidate: ‘template<class _Tp> std::_Expr<std::_BinClos<std::__plus, std::_Constant, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__plus, _Tp>::result_type> std::operator+(const _Tp&, const std::valarray<_Tp>&)’
 _DEFINE_BINARY_OPERATOR(+, __plus)
 ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/8/valarray:1172:1: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   mismatched types ‘const std::valarray<_Tp>’ and ‘int’
  sort(s,s+n);
           ^
In file included from /usr/include/c++/8/bits/stl_algobase.h:67,
                 from /usr/include/c++/8/bits/char_traits.h:39,
                 from /usr/include/c++/8/ios:40,
                 from /usr/include/c++/8/ostream:38,
                 from /usr/include/c++/8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/8/bits/stl_iterator.h:973:5: note: candidate: ‘template<class _Iterator, class _Container> __gnu_cxx::__normal_iterator<_Iterator, _Container> __gnu_cxx::operator+(typename __gnu_cxx::__normal_iterator<_Iterator, _Container>::difference_type, const __gnu_cxx::__normal_iterator<_Iterator, _Container>&)’
     operator+(typename __normal_iterator<_Iterator, _Container>::difference_type
     ^~~~~~~~
/usr/include/c++/8/bits/stl_iterator.h:973:5: note:   template argument deduction/substitution failed:
prog.cpp:10:11: note:   mismatched types ‘const __gnu_cxx::__normal_iterator<_Iterator, _Container>’ and ‘int’
  sort(s,s+n);
           ^

Standard output is empty