#include<stdio.h>
#include<string.h>


int main(){
char s[1000];
char t[1000];
gets(s);
gets(t);
int b[3];
int a[3];
a[0]=atoi(strtok(s,"."));
	a[1]=atoi(strtok(NULL,"."));
	a[2]=atoi(strtok(NULL,"."));
	b[0]=atoi(strtok(t,"."));
	b[1]=atoi(strtok(NULL,"."));
	b[2]=atoi(strtok(NULL,"."));
	if(a[0]>b[0]){
		
		
		printf("YES\n");
	}else if(b[1]<a[1]&&a[0]==b[0]){
		
		printf("YES\n");
		
		
	}else if(a[2]>=b[2]&&a[1]==b[1]&&a[0]==b[0]){
		
		printf("YES\n");
		
	}else{
		
		printf("NO\n");
		//printf("%d %dYES\n",a[2],b[2]);
	}
	return 0;
}