#include <bits/stdc++.h>

using namespace std;

const int INF = 1 << 30;

int main()
{
  int A0, B0, C0, A1, B1, C1;
  scanf("%d.%d.%d", &A0, &B0, &C0);
  scanf("%d.%d.%d", &A1, &B1, &C1);
  if(make_tuple(A0, B0, C0) >= make_tuple(A1, B1, C1)) {
    cout << "YES" << endl;
  } else {
    cout << "NO" << endl;
  }
}