#include <iostream>
#include <cmath>
#include <cstdlib>
#include <cstdio>
using namespace std;
int main(){
	int data1=0,data2=0,d1[3],d2[3];
	scanf("%d.%d.%d",&d1[0],&d1[1],&d1[2]);
	scanf("%d.%d.%d",&d2[0],&d2[1],&d2[2]);
	data1=d1[0]*1000000+d1[1]*1000+d1[2];
	data2=d2[0]*1000000+d2[1]*1000+d2[2];
	if(data1>=data2)	cout<<"YES"<<endl;
	else 	cout<<"NO"<<endl;
	return 0;
}