#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>

int main(void) {
	int fsl[3], crt[3];
	int judge = 0;

	scanf("%d.%d.%d", &fsl[0], &fsl[1], &fsl[2]);
	scanf("%d.%d.%d", &crt[0], &crt[1], &crt[2]);

	if (crt[0] < fsl[0])
		judge++;
	else if (crt[1] < fsl[1])
		judge++;
	else if (crt[2] <= fsl[2])
		judge++;

	if (judge != 0)
		puts("YES");
	else
		puts("NO");

	return 0;
}