foo.cc: In function 'int main()':
foo.cc:13:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |         for(int i = 0;i < a.size();i++)x*=(a[i]-'A'+1);
      |                       ~~^~~~~~~~~~
foo.cc:14:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |         for(int i = 0;i < b.size();i++)y*=(b[i]-'A'+1);
      |                       ~~^~~~~~~~~~

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