/* -*- coding: utf-8 -*-
 *
 * 1941.cc:  No.1941 CHECKER×CHECKER(1) - yukicoder
 */

#include<cstdio>
#include<algorithm>
 
using namespace std;

/* constant */

const int N = 3;
const int NN = N * N;

/* typedef */

/* global variables */

char s[NN + 4];

/* subroutines */

/* main */

int main() {
  for (int i = 0; i < N; i++) scanf("%s", s + i * N);
  //puts(s);

  char cs[] = "#.";
  if (s[0] == '.') swap(cs[0], cs[1]);

  for (int i = 0; i < NN; i++)
    if (s[i] != cs[i & 1]) { puts("No"); return 0; }

  puts("Yes");
  return 0;
}