#include<stdio.h>

int main(void){
	int a,b,c,a1,b1,c1;
	scanf("%d.%d.%d\n%d.%d.%d",&a,&b,&c,&a1,&b1,&c1);;
	if(a>a1){printf("YES\n");return 0;}
	if(a<a1){printf("NO\n");return 0;}
	if(b>b1){printf("YES\n");return 0;}
	if(b<b1){printf("NO\n");return 0;}
	if(c<c1){printf("NO\n");return 0;}
	printf("YES\n");
	return 0;
}