/in/foo.cc: In function 'std::__cxx11::string Change(std::__cxx11::string)':
/in/foo.cc:69:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i =0; i < s.size(  ); i ++)if( s[ i ]>='A'&& s[ i ]<='Z'){
                   ~~^~~~~~~~~~~~
/in/foo.cc: In function 'int Find(std::__cxx11::string)':
/in/foo.cc:85:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^