#include <bits/stdc++.h>
using namespace std;

int main() {
	vector<int> v1(3), v2(3);
	for (int i = 0; i < 10; i++) {
		if (i < 5) {
			if (i == 1 || i == 3) {
				char c;
				cin >> c;
			}
			else {
				int n;
				cin >> n;
				v1.push_back(n);
			}
		}
		else {
			if (i == 6 || i == 8) {
				char c;
				cin >> c;
			}
			else {
				int n;
				cin >> n;
				v2.push_back(n);
			}
		}
	}

	if (v1 < v2) {
		cout << "NO" << endl;
	}
	else {
		cout << "YES" << endl;
	}
}