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#include <iostream>
#include <string>
#include <algorithm>
#include <iostream>
using namespace std;
 
int main() {
	string s = "Onetwothree";
	int lc = count_if(s.begin(), s.end(), islower);
	int uc = count_if(s.begin(), s.end(), isupper);
	cout << uc << " " << lc << endl;
	return 0;
}

prog.cpp: In function 'int main()':
prog.cpp:9:47: error: no matching function for call to 'count_if(std::basic_string<char>::iterator, std::basic_string<char>::iterator, <unresolved overloaded function type>)'
  int lc = count_if(s.begin(), s.end(), islower);
                                               ^
In file included from /usr/include/c++/5/algorithm:62:0,
                 from prog.cpp:3:
/usr/include/c++/5/bits/stl_algo.h:3982:5: note: candidate: template<class _IIter, class _Predicate> typename std::iterator_traits<_Iterator>::difference_type std::count_if(_IIter, _IIter, _Predicate)
     count_if(_InputIterator __first, _InputIterator __last, _Predicate __pred)
     ^
/usr/include/c++/5/bits/stl_algo.h:3982:5: note:   template argument deduction/substitution failed:
prog.cpp:9:47: note:   couldn't deduce template parameter '_Predicate'
  int lc = count_if(s.begin(), s.end(), islower);
                                               ^
prog.cpp:10:47: error: no matching function for call to 'count_if(std::basic_string<char>::iterator, std::basic_string<char>::iterator, <unresolved overloaded function type>)'
  int uc = count_if(s.begin(), s.end(), isupper);
                                               ^
In file included from /usr/include/c++/5/algorithm:62:0,
                 from prog.cpp:3:
/usr/include/c++/5/bits/stl_algo.h:3982:5: note: candidate: template<class _IIter, class _Predicate> typename std::iterator_traits<_Iterator>::difference_type std::count_if(_IIter, _IIter, _Predicate)
     count_if(_InputIterator __first, _InputIterator __last, _Predicate __pred)
     ^
/usr/include/c++/5/bits/stl_algo.h:3982:5: note:   template argument deduction/substitution failed:
prog.cpp:10:47: note:   couldn't deduce template parameter '_Predicate'
  int uc = count_if(s.begin(), s.end(), isupper);
                                               ^

Standard output is empty