#include <bits/stdc++.h>

using namespace std;

tuple<int, int, int> input() {
	int a, b, c; scanf("%d.%d.%d", &a, &b, &c);
	return make_tuple(a, b, c);
}

int main() {
	tuple<int, int, int> a = input(), b = input();
	if (b <= a) cout << "YES" << endl;
	else cout << "NO" << endl;
}