#include <iostream>
#include <cassert>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);

  string T;
  for (int i = 0; i < 3; i++) {
    string S; cin >> S;
    T += S;
  }
  bool ok = true;
  for (int i = 1; i < 9; i++) {
    ok &= T[i] != T[i - 1];
  }
  cout << (ok? "Yes": "No") << endl;
  return 0;
}