#include<stdio.h>
int main()
{
	int a[2], b[2], c[2];
	scanf("%d.%d.%d%d.%d.%d", &a[0], &b[0], &c[0], &a[1], &b[1], &c[1]);
	if (a[0] > a[1])printf("YES\n");
	else if (a[0] < a[1])printf("NO\n");
	else if (b[0] > b[1])printf("YES\n");
	else if (b[0] < b[1])printf("NO\n");
	else if (c[0] < c[1])printf("NO\n");
	else printf("YES\n");
	return 0;
}