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