/in/foo.cc: In function 'int main()':
/in/foo.cc:8:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i=0; i<Str.size(); i++){
                   ~^~~~~~~~~~~
/in/foo.cc:10:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int j=0, __index__; j<GoalStr.size(); j++){
                                  ~^~~~~~~~~~~~~~~
/in/foo.cc:12:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if (__index__>Str.size()-1) __index__ -= Str.size();
                 ~~~~~~~~~^~~~~~~~~~~~~