#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>

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

	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])
		puts("YES");
	else if (crt[0] > fsl[0])
		puts("NO");
	else {
		if (crt[1] < fsl[1])
			puts("YES");
		else if (crt[1] > fsl[1])
			puts("NO");
		else {
			if (crt[2] < fsl[2])
				puts("YES");
			else if (crt[2] > fsl[2])
				puts("NO");
			else
				puts("YES");
		}
	}
		
	return 0;
}