#include<stdio.h>

int main(void){
	int a, b, c;
	int a1, b2, c3;
	scanf("%d.%d.%d", &a, &b, &c);
	scanf("%d.%d.%d", &a1, &b2, &c3);
	
	if(a > a1){
		printf("yes");
	}else if(a == a1 && b > b2){
		printf("yes");
	}else if(a == a1 && b == b2 && c >= c3){
		printf("yes");
	}else{
			printf("no");
	}
	
	return 0;
}