#include <bits/stdc++.h>
using namespace std;

int main() {
  int a, b, c, d, e, f;
  scanf("%d.%d.%d", &a, &b, &c);
  scanf("%d.%d.%d", &d, &e, &f);
  cout << ((a * 1000000 + b * 1000 + c >= d * 1000000 + e * 1000 + f) ? "YES" : "NO") << "\n";
}