foo.cc: In function 'int main()':
foo.cc:18:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |     for(int i=0;i<x.size();i++){
      |                 ~^~~~~~~~~
foo.cc:33:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |     for(int i=0;i<z.size();++i) printf("%c",c[z[i]-'A'+1]);
      |                 ~^~~~~~~~~

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