Main.cc: In function 'int main()':
Main.cc:17:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |     for(int i=0;i<s.size();i++){
      |                 ~^~~~~~~~~
Main.cc:27:36: error: expected ';' before '}' token
   27 |         cout<<i.first<<i.first<<' '
      |                                    ^
      |                                    ;
   28 |     }
      |     ~