#include <iostream>

using namespace std;

int main() {
  int a1, b1, c1, a2, b2, c2, a, b;
  scanf("%d.%d.%d", &a1, &b1, &c1);
  scanf("%d.%d.%d", &a2, &b2, &c2);
  
  if (a1>a2) {
    cout << "YES" << endl;
  } else if (a1<a2) {
    cout << "NO" << endl;
  } else {
    if (b1>b2) {
      cout << "YES" << endl;
    } else if (b1<b2) {
      cout << "NO" << endl;
    } else {
      if (c1<c2) {
        cout << "NO" << endl;
      } else {
        cout << "YES" << endl;
      }
    }
  }
  return 0;
}