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