func_code_string: #include <bits/stdc++.h>   using namespace std;   char m[1000000];   int main() {     int t, i, j;     string s;     cin >> t;     cin >> s;     int l = s.length();     for (i = 0; i < l; i++) m[i] = s[i];     for (i = 1; i < t; i++) {       cin >> s;       for (j = 0; j < l; j++) {         if (m[j] ==  ? ) m[j] = s[j];         if (m[j] != s[j] && s[j] !=  ? ) m[j] =  ! ;       }     }     for (i = 0; i < l; i++) {       if (m[i] ==  ? )         cout <<  x ;       else if (m[i] ==  ! )         cout <<  ? ;       else         cout << m[i];     }     return 0;   }   