func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, m;     cin >> n >> m;     char arr[100][100];     for (int i = 0; i < n; i++) {       for (int j = 0; j < m; j++) {         cin >> arr[i][j];         if (arr[i][j] ==  - ) {           arr[i][j] =  - ;         } else {           if (i % 2 == 0 && j % 2 == 0) {             arr[i][j] =  B ;           } else if (i % 2 == 0 && j % 2 != 0) {             arr[i][j] =  W ;           } else if (i % 2 != 0 && j % 2 == 0) {             arr[i][j] =  W ;           } else if (i % 2 != 0 && j % 2 != 0) {             arr[i][j] =  B ;           }         }         cout << arr[i][j];       }       cout << endl;     }   }   