/in/foo.cc: In function 'int main()':
/in/foo.cc:20:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i = 0;i < str.length();i ++)
                 ~~^~~~~~~~~~~~~~
/in/foo.cc:41:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int j = 0;j < str.length();j ++)
                  ~~^~~~~~~~~~~~~~
/in/foo.cc:75:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int j = 0;j < str.length();j ++)
                  ~~^~~~~~~~~~~~~~
/in/foo.cc:35:12: warning: 'chMax' may be used uninitialized in this function [-Wmaybe-uninitialized]
  t = chMax - 'e';
      ~~~~~~^~~~~