#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <utility>

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);

	bool ret = true;
	if (a < d) {
		ret = false;
	} else if  (b < e) {
		ret = false;
	} else if (c <= f) {
		ret = false;
	}
	cout << (ret ? "YES" : "NO") << endl;
	return 0;
}