#include <stdio.h>

int main(void){
	int l,r;
	int a, b, c;
	int x, y, z;
	scanf("%d.%d.%d", &a,&b,&c);
	scanf("%d.%d.%d", &x,&y,&z);
	
	l = (a*1000*1000) + b*1000 + c;
	r = (x*1000*1000) + y*1000 + z;
	
	if( r <= l){
		printf("YES\n");
	}else{
		printf("NO\n");
	}
	
	return 0;
}