/in/foo.cc: In function 'int main()':
/in/foo.cc:12:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 1;i <= s.length() - 1;i++){
                ~~^~~~~~~~~~~~~~~~~
/in/foo.cc:28:1: error: expected '}' at end of input
 }
 ^