/in/foo.cc: In function 'int main()':
/in/foo.cc:11:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i <= target.size(); i++)
                  ~~^~~~~~~~~~~~~~~~
/in/foo.cc:13:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if (i==target.size()||target[i] == ' ' || target[i] == ',' || target[i] == '.')
       ~^~~~~~~~~~~~~~~