func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, m;     cin >> n >> m;     char a[53][53] = {5};     int ans = 0;     for (int i = 0; i < n; i++)       for (int j = 0; j < m; j++) {         char x;         cin >> x;         if (x ==  a  || x ==  f  || x ==  c  || x ==  e ) a[i][j] = x;       }     for (int i = 0; i < n; i++)       for (int j = 0; j < m; j++) {         string c =   ;         c += a[i][j];         c += a[i][j + 1];         c += a[i + 1][j];         c += a[i + 1][j + 1];         sort(c.begin(), c.end());         if (c ==  acef ) ans += 1;       }     cout << ans;     return 0;   }   