func_code_string: #include <bits/stdc++.h>   using namespace std;   char ch[100010], temp[100010];   bool ok[100010];   int main() {     int n;     cin >> n;     cin >> ch;     int m = strlen(ch);     for (int i = 1; i < n; i++) {       cin >> temp;       for (int j = 0; j < m; j++) {         if (ch[j] >=  a  && ch[j] <=  z  && temp[j] >=  a  && temp[j] <=  z  &&             ch[j] != temp[j])           ok[j] = 1, ch[j] =  ? ;         if (ch[j] ==  ?  && !ok[j]) ch[j] = temp[j];       }     }     for (int i = 0; i < m; i++) {       if (ch[i] ==  ?  && !ok[i])         cout <<  x ;       else         cout << ch[i];     }     return 0;   }   