#include <bits/stdc++.h>
using namespace std;
char s[7][7];
int main()
{
const int N = 3;
const int M = 4;
for (int i = 1; i <= N; i ++)
scanf ("%s", s[i] + 1);
for (int i = 1; i <= N; i ++)
for (int j = 1; j <= N; j ++)
if (s[i][j] != s[M - i][M - j])
{
puts("NO");
return 0;
}
puts("YES");
return 0;
}