#include <bits/stdc++.h>
using namespace std;
int main(int argc, char** argv) {
  char s[3][3];
  bool is = false;
  for (int i = 0; i < 3; i++) {
    for (int j = 0; j < 3; j++) {
      cin >> s[i][j];
      if (s[i][j] == 'X') is = true;
    }
  }
  int i = 0, j = 0;
  bool isY = true;
  for (int i = 0; i < 3; i++) {
    for (int j = 0; j < 3; j++)
      if (s[i][j] != s[2 - i][2 - j]) isY = false;
  }
  if (isY)
    cout << "YES";
  else
    cout << "NO";
  return 0;
}
