/in/foo.cc: In function 'int main()':
/in/foo.cc:22:14: error: 'H' was not declared in this scope
   22 |         cin>>H;
      |              ^
/in/foo.cc:23:15: error: 'print_a' was not declared in this scope; did you mean 'print_a_'?
   23 |         cout<<print_a(H);
      |               ^~~~~~~
      |               print_a_