func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     char spots[9][9];     for (int i = 0; i < 9; i++) {       for (int j = 0; j < 3; j++) {         string input;         cin >> input;         for (int k = 0; k < input.size(); k++) {           spots[i][j * 3 + k] = input[k];         }       }     }     int first, second;     cin >> first >> second;     first--;     second--;     int targetedFirst = first % 3;     int targetedSecond = second % 3;     bool changed = false;     for (int i = targetedFirst * 3; i < targetedFirst * 3 + 3; i++) {       for (int j = targetedSecond * 3; j < targetedSecond * 3 + 3; j++) {         if (spots[i][j] ==  . ) {           changed = true;           spots[i][j] =  ! ;         }       }     }     if (changed == false) {       for (int i = 0; i < 9; i++) {         for (int j = 0; j < 9; j++) {           if (spots[i][j] ==  . ) {             spots[i][j] =  ! ;           }         }       }     }     for (int i = 0; i < 9; i++) {       for (int j = 0; j < 9; j++) {         cout << spots[i][j];         if (j % 3 == 2) {           cout <<    ;         }       }       if (i % 3 == 2 && i != 8) {         cout << endl;       }       cout << endl;     }     return 0;   }   