func_code_string: #include <bits/stdc++.h>   using namespace std;   char s[100005];   int c[100005], N, full;   int LG;   void read() {     scanf( %d n , &N);     for (int line = 1; line <= N; ++line) {       scanf( %s , s + 1);       s[0] =  # ;       int len = strlen(s) - 1;       LG = len;       for (int i = 1; i <= len; ++i) {         if (s[i] ==  ? ) continue;         if (c[i] == 0) {           c[i] = s[i] -  a  + 1;           continue;         }         if (c[i] == s[i] -  a  + 1)           continue;         else {           if (c[i] != -1) {             c[i] = -1;             full++;           }           if (full == len) return;         }       }     }   }   int main() {     read();     for (int i = 1; i <= LG; ++i)       if (c[i] == -1)         printf( ? );       else if (c[i] == 0)         printf( x );       else         printf( %c , c[i] +  a  - 1);     return 0;   }   