#include <iostream>
using namespace std;
int main(void) {
	int a1, b1, c1, a2, b2, c2;
	char c;
	cin >> a1 >> c >> b1 >> c >> c1 
		>> a2 >> c >> b2 >> c >> c2;
	bool ok = true;
	if (a1 < a2) ok = false;
	else if (a1 == a2) {
		if (b1 < b2) ok = false;
		else if (b1 == b2) {
			if (c1 < c2) ok = false;
		}
	}
	cout << (ok ? "YES" : "NO") << endl;
	return 0;
}