#include <stdio.h>

int main() {
	int a[2], b[2], c[2], old, i;

	for (i = 0; i < 2; i++) {
		scanf("%d.%d.%d", &a[i], &b[i], &c[i]);
	}
	
	if (a[1] == a[0]) {
		if (b[1] == b[0]) {
			if (c[1] <= c[0]) old = 1;
			else old = 0;
		}
		else if (b[1] < b[0]) old = 1;
		else old = 0;
	}
	else if (a[1] < a[0]) old = 1;
	else old = 0;

	if (old == 1) printf("YES\n");
	else printf("NO\n");

	return 0;
}