#include <stdio.h>
#define F(i,n) for(int i = 0;i < n;i++)
#define Y {puts("YES");return 0;}
#define N {puts("NO");return 0;}

int main(void){
	int a[3],b[3];
	scanf("%d.%d.%d",&a[0],&a[1],&a[2]);
	scanf("%d.%d.%d",&b[0],&b[1],&b[2]);
	F(i,3){if(a[i]>b[i])Y else if(a[i]<b[i])N }
	Y
}