func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios::sync_with_stdio(0);     char board[9][9];     char trash;     for (long r = 0; r < 3; ++r) {       for (long x = 0; x < 3; ++x) {         for (long c = 0; c < 3; ++c) {           for (long y = 0; y < 3; ++y) cin >> board[3 * r + x][3 * c + y];           if (c == 5) cin >> trash;         }       }     }     long x, y;     cin >> x >> y;     --x, --y;     x %= 3;     y %= 3;     bool empty = false;     for (long i = 0; i < 3; ++i)       for (long j = 0; j < 3; ++j)         if (board[3 * x + i][3 * y + j] ==  . ) empty = true;     if (empty) {       for (long i = 0; i < 3; ++i)         for (long j = 0; j < 3; ++j)           if (board[3 * x + i][3 * y + j] ==  . )             board[3 * x + i][3 * y + j] =  ! ;     } else {       for (long i = 0; i < 9; ++i)         for (long j = 0; j < 9; ++j)           if (board[i][j] ==  . ) board[i][j] =  ! ;     }     for (long r = 0; r < 3; ++r) {       for (long x = 0; x < 3; ++x) {         for (long c = 0; c < 3; ++c) {           for (long y = 0; y < 3; ++y) cout << board[3 * r + x][3 * c + y];           if (c < 2) cout <<    ;         }         cout <<   n ;       }       cout <<   n ;     }   }   