#include <bits/stdc++.h>
using namespace std;
int freq[4];
int main() {
  char s[3][3];
  for (int i = 0; i < 3; i++)
    for (int j = 0; j < 3; j++) cin >> s[i][j];
  if (s[0][0] == s[2][2] && s[0][2] == s[2][0] && s[1][0] == s[1][2] &&
      s[0][1] == s[2][1])
    cout << "YES";
  else
    cout << "NO";
}
