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#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
bool pref(string a, string b){
	if(a.size()< b.size())
	return a == b.substr(0,a.size());
	else return 0;
}
int main() {
    int n;
    cin>>n;
    string str(n);
    for(int i = 0;i<n;i++){
    	cin>>str(i);
    }
    int ct = 0;
    for(int i =0;i<n;i++){
    	for(int j = i+1 ;j<n;j++){
    		if(pref(str[i], str[j])){
    			cout<<"BAD SET"<<endl<<str[j];
    			ct = 1;
    			break;
    		}
    		if(ct ==1 ){break;
    		}
 
    	}
    }
    return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:15:17: error: no matching function for call to ‘std::__cxx11::basic_string<char>::basic_string(int&)’
     string str(n);
                 ^
In file included from /usr/include/c++/6/string:52:0,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:4:
/usr/include/c++/6/bits/basic_string.h:549:9: note: candidate: template<class _InputIterator, class> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(_InputIterator, _InputIterator, const _Alloc&)
         basic_string(_InputIterator __beg, _InputIterator __end,
         ^~~~~~~~~~~~
/usr/include/c++/6/bits/basic_string.h:549:9: note:   template argument deduction/substitution failed:
prog.cpp:15:17: note:   candidate expects 3 arguments, 1 provided
     string str(n);
                 ^
In file included from /usr/include/c++/6/string:52:0,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:4:
/usr/include/c++/6/bits/basic_string.h:511:7: note: candidate: std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]
       basic_string(basic_string&& __str, const _Alloc& __a)
       ^~~~~~~~~~~~
/usr/include/c++/6/bits/basic_string.h:511:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/6/bits/basic_string.h:507:7: note: candidate: std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]
       basic_string(const basic_string& __str, const _Alloc& __a)
       ^~~~~~~~~~~~
/usr/include/c++/6/bits/basic_string.h:507:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/6/bits/basic_string.h:503:7: note: candidate: std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::initializer_list<_Tp>, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]
       basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
       ^~~~~~~~~~~~
/usr/include/c++/6/bits/basic_string.h:503:7: note:   no known conversion for argument 1 from ‘int’ to ‘std::initializer_list<char>’
/usr/include/c++/6/bits/basic_string.h:476:7: note: candidate: std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]
       basic_string(basic_string&& __str) noexcept
       ^~~~~~~~~~~~
/usr/include/c++/6/bits/basic_string.h:476:7: note:   no known conversion for argument 1 from ‘int’ to ‘std::__cxx11::basic_string<char>&&’
/usr/include/c++/6/bits/basic_string.h:464:7: note: candidate: std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, _CharT, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]
       basic_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc())
       ^~~~~~~~~~~~
/usr/include/c++/6/bits/basic_string.h:464:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/6/bits/basic_string.h:454:7: note: candidate: std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>] <near match>
       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
       ^~~~~~~~~~~~
/usr/include/c++/6/bits/basic_string.h:454:7: note:   conversion of argument 1 would be ill-formed:
prog.cpp:15:17: error: invalid conversion from ‘int’ to ‘const char*’ [-fpermissive]
     string str(n);
                 ^
In file included from /usr/include/c++/6/string:52:0,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:4:
/usr/include/c++/6/bits/basic_string.h:444:7: note: candidate: std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]
       basic_string(const _CharT* __s, size_type __n,
       ^~~~~~~~~~~~
/usr/include/c++/6/bits/basic_string.h:444:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/6/bits/basic_string.h:426:7: note: candidate: std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]
       basic_string(const basic_string& __str, size_type __pos,
       ^~~~~~~~~~~~
/usr/include/c++/6/bits/basic_string.h:426:7: note:   candidate expects 4 arguments, 1 provided
/usr/include/c++/6/bits/basic_string.h:410:7: note: candidate: std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]
       basic_string(const basic_string& __str, size_type __pos,
       ^~~~~~~~~~~~
/usr/include/c++/6/bits/basic_string.h:410:7: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/6/bits/basic_string.h:397:7: note: candidate: std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]
       basic_string(const basic_string& __str)
       ^~~~~~~~~~~~
/usr/include/c++/6/bits/basic_string.h:397:7: note:   no known conversion for argument 1 from ‘int’ to ‘const std::__cxx11::basic_string<char>&’
/usr/include/c++/6/bits/basic_string.h:389:7: note: candidate: std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _Alloc&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]
       basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT
       ^~~~~~~~~~~~
/usr/include/c++/6/bits/basic_string.h:389:7: note:   no known conversion for argument 1 from ‘int’ to ‘const std::allocator<char>&’
/usr/include/c++/6/bits/basic_string.h:380:7: note: candidate: std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string() [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]
       basic_string()
       ^~~~~~~~~~~~
/usr/include/c++/6/bits/basic_string.h:380:7: note:   candidate expects 0 arguments, 1 provided
prog.cpp:17:16: error: no match for call to ‘(std::__cxx11::string {aka std::__cxx11::basic_string<char>}) (int&)’
      cin>>str(i);
                ^
prog.cpp:22:29: error: could not convert ‘str.std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator[]<char, std::char_traits<char>, std::allocator<char> >(((std::__cxx11::basic_string<char>::size_type)i))’ from ‘__gnu_cxx::__alloc_traits<std::allocator<char> >::value_type {aka char}’ to ‘std::__cxx11::string {aka std::__cxx11::basic_string<char>}’
       if(pref(str[i], str[j])){
                             ^

Standard output is empty