#include <bits/stdc++.h>   int main() {     int x, count = 0, i;     char ar[50];     for (i = 0; i < 9; i++) scanf(  %c , &ar[i]);     for (i = 0; i < 9; i++) {       if (ar[i] == ar[8 - i]) count++;     }     if (count == 9)       printf( YES );     else       printf( NO );   }   