func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     string s;     cin >> s;     int x = 0, y = 0;     for (int i = 0; i < s.size(); i++) {       x = x % 4;       y = y % 4;       if (s[i] ==  0 ) {         cout << 3 <<     << y + 1 << endl;         y++;       } else {         cout << 1 <<     << x + 1 << endl;         x += 2;       }     }     return 0;   }   