/in/foo.cc: In function 'int main()':
/in/foo.cc:16:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 for(int i = 0;i < str.length();i ++){
               ~~^~~~~~~~~~~~~~
/in/foo.cc:33:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 for(int j = 0;j < str.length();j ++){
               ~~^~~~~~~~~~~~~~
/in/foo.cc:56:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 for(int j = 0;j < str.length();j ++){
               ~~^~~~~~~~~~~~~~
/in/foo.cc:29:11: warning: 'chMax' may be used uninitialized in this function [-Wmaybe-uninitialized]
 t = chMax - 'e';
     ~~~~~~^~~~~