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

int main() {
  int a, b, c;
  int x, y;
  scanf("%d.%d.%d", &a, &b, &c);
  x = a * 1000000 + b * 1000 + c;
  scanf("%d.%d.%d", &a, &b, &c);
  y = a * 1000000 + b * 1000 + c;
  if (x >= y) {
    cout << "YES" << endl;
  } else {
    cout << "NO" << endl;
  }
  return 0;
}