#include <iostream>
using namespace std;

int main()
{
	int a[3], b[3];
	scanf("%d.%d.%d", a, a + 1, a + 2);
	scanf("%d.%d.%d", b, b + 1, b + 2);
	for (int i = 0; i < 3; i++) {
		if (a[i] < b[i]) {
			cout << "NO" << endl;
			return 0;
		}
		else if (a[i] > b[i]) {
			cout << "YES" << endl;
			return 0;
		}
	}
	cout << "YES" << endl;
	return 0;
}