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