#include<stdio.h>
#include<iostream>
using namespace std;

int main(void)
{
	int a1, b1, c1, a2, b2, c2;
	scanf("%d.%d.%d %d.%d.%d", &a1, &b1, &c1, &a2, &b2, &c2);
	if (a1 > a2 || a1 == a2&&b1 > b2 || a1 == a2&&b1 == b2&&c1 >= c2)
		cout << "YES" << endl;
	else cout << "NO" << endl;
	return 0;
}