Main.cc: In function 'int main()':
Main.cc:6:11: error: 'to_sting' was not declared in this scope
    6 |     int n=to_sting(num).size();
      |           ^~~~~~~~
Main.cc:7:5: error: 'result' was not declared in this scope
    7 |     result=num%n;
      |     ^~~~~~