#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  char a[111][111];
  for (long long i = 1; i <= 3; i++)
    for (long long j = 1; j <= 3; j++) cin >> a[i][j];
  if (a[1][1] == a[3][3] && a[3][2] == a[1][2] && a[3][1] == a[1][3] &&
      a[2][3] == a[2][1])
    cout << "YES";
  else
    cout << "NO";
  return 0;
}
