#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);
  a=(a1*100)+(b1*10)+c1;
  b=(a2*100)+(b2*10)+c2;

  cout << (a>b ? "YES": "NO") << endl;
  return 0;
}