#include<iostream>
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);
	if (a * 10201 + b * 101 + c >= d * 10201 + e * 101 + f) {
		cout << "YES" << endl;
	}
	else {
		cout << "NO" << endl;
	}
}