func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(0);     cin.tie(NULL);     char a[9][9], c;     int i, j, x, y;     string s;     for (i = 0; i < 9; i++) {       for (j = 0; j < 3; j++) {         cin >> s;         a[i][3 * j] = s[0];         a[i][3 * j + 1] = s[1];         a[i][3 * j + 2] = s[2];       }     }     cin >> x >> y;     x--;     y--;     x %= 3;     y %= 3;     bool b = 0;     for (i = 0; i < 3; i++) {       for (j = 0; j < 3; j++) {         if (a[3 * x + i][3 * y + j] ==  . ) b = 1;       }     }     if (b) {       for (i = 0; i < 9; i++) {         if (i % 3 == 0 && i != 0) cout <<   n ;         for (j = 0; j < 9; j++) {           if (j % 3 == 0 && j != 0) cout <<    ;           if (x != i / 3 || y != j / 3)             cout << a[i][j];           else {             if (a[i][j] ==  . )               cout <<  ! ;             else               cout << a[i][j];           }         }         cout <<   n ;       }     } else {       for (i = 0; i < 9; i++) {         if (i % 3 == 0 && i != 0) cout <<   n ;         for (j = 0; j < 9; j++) {           if (j % 3 == 0 && j != 0) cout <<    ;           if (a[i][j] ==  . )             cout <<  ! ;           else             cout << a[i][j];         }         cout <<   n ;       }     }   }   