#include<stdio.h>
#include<algorithm>
using namespace std;
int main(){
	int a,b,c,d,e,f;
	scanf("%d.%d.%d",&a,&b,&c);
	scanf("%d.%d.%d",&d,&e,&f);
	if(a>d){printf("YES\n");return 0;}
	if(a<d){printf("NO\n");return 0;}
	if(b>e){printf("YES\n");return 0;}
	if(b<e){printf("NO\n");return 0;}
	if(c>=f){printf("YES\n");return 0;}
	if(c<f){printf("NO\n");return 0;}
	
}