#include <stdio.h>

int main()
{
	int a, b, c, d, e, f;
	scanf("%d.%d.%d%d.%d.%d", &a, &b, &c, &d, &e, &f);

	if(a < d || ((a == d) && (b < e)) || (((a == d) && (b == e)) && (c < f)))
	{
		printf("%s\n", "NO");
		return 0;
	}

	printf("%s\n", "YES");
	return 0;
}