#include <iostream>
using namespace std;

int main(void)
{
	int a, b, c, d, e, f;
	scanf("%d.%d.%d", &a, &b, &c);
	scanf("%d.%d.%d", &d, &e, &f);
	if(a*1000000+b*1000+c >= d*1000000+e*1000+f) {
		cout << "YES" << endl;
	}
	else {
		cout << "NO" << endl;
	}
}