foo.cc: In function 'int main()':
foo.cc:14:12: 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(i=0;i<a.length();i++)
      |           ~^~~~~~~~~~~
foo.cc:23:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |   for(i=0;i<b.length();i++)
      |           ~^~~~~~~~~~~

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