#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);

	int x = a * 1000000 + b * 1000 + c;
	int y = d * 1000000 + e * 1000 + f;

	cout << (y - x > 0 ? "NO" : "YES") << endl;
	return 0;
}