func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, len = 0, max = 0, flag = 1;     cin >> n;     string alpha =  abcdefghijklmnopqrstuvwxyz ;     vector<string> vs(n);     for (int i = 0; i < n; i++) cin >> vs[i];     for (auto i : alpha) {       for (auto j : alpha) {         len = 0;         for (auto k : vs) {           flag = 1;           for (auto l : k) {             if (l != i && l != j) {               flag = 0;               break;             }           }           if (flag) len += k.size();         }         if (len > max) max = len;       }     }     cout << max;     return 0;   }   