#include <bits/stdc++.h>   int main() {     char a[3][4];     int i, f;     for (i = 0; i < 3; i++) scanf( %s , a[i]);     if (a[0][0] == a[2][2] && a[0][1] == a[2][1] && a[0][2] == a[2][0] &&         a[1][0] == a[1][2])       f = 1;     else       f = 0;     if (f == 1)       printf( YES n );     else       printf( NO n );     return 0;   }   