#include <stdio.h>

int main(void)
{
	int a[2], b[2], c[2];
	for (int i = 0; i < 2; i++) scanf("%d.%d.%d", &a[i], &b[i], &c[i]);
	puts(a[0] * 100 + b[0] * 10 + c[0] >= a[1] * 100 + b[1] * 10 + c[1] ? "YES" : "NO");
	return 0;
}