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