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