#include <stdio.h>

int main()
{
	int originver[3],checkver[3];

	scanf("%d.%d.%d", &originver[0], &originver[1], &originver[2]);
	scanf("%d.%d.%d", &checkver[0], &checkver[1], &checkver[2]);

	int first = originver[0] * 1000000 + originver[1] * 1000 + originver[2] * 1;
	int second = checkver[0] * 1000000 + checkver[1] * 1000 + checkver[2] * 1;

	if (second <= first)
	{
		printf("YES");
	}
	else
	{
		printf("NO");
	}

	return 0;
}