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