func_code_string: #include <bits/stdc++.h>   int n, m;   char map[1010][1010], ans[1010][1010];   int main() {     scanf( %d%d , &n, &m);     for (int i = 1; i <= n; i++) scanf( %s , map[i] + 1);     for (int i = 1; i <= n; i++)       for (int j = 1; j <= m; j++) ans[i][j] =  . ;     for (int i = 1; i <= n; i++)       for (int j = 1; j <= m; j++) {         if (map[i][j] !=  b ) continue;         int c =  a  + 2 * ((i / 2 + j / 2) % 2) + i % 2;         if (map[i - 1][j] ==  w  && map[i + 1][j] ==  w )           ans[i - 1][j] = ans[i][j] = ans[i + 1][j] = c,                   map[i - 1][j] = map[i][j] = map[i + 1][j] =  . ;         else if (map[i][j - 1] ==  w  && map[i][j + 1] ==  w )           ans[i][j - 1] = ans[i][j] = ans[i][j + 1] = c,                      map[i][j - 1] = map[i][j] = map[i][j + 1] =  . ;       }     bool ok = true;     for (int i = 1; i <= n; i++)       for (int j = 1; j <= m; j++)         if (map[i][j] !=  . ) ok = false;     puts(ok ?  YES  :  NO );     if (ok)       for (int i = 1; i <= n; i++) {         for (int j = 1; j <= m; j++) putchar(ans[i][j]);         putchar(  n );       }     return 0;   }   