#define _USE_MATH_DEFINES
#include<stdio.h>
#include<string>
#include<iostream>
#include<cctype>
#include<cstdio>
#include<vector>
#include<stack>
#include <algorithm>
#include<math.h>
#include<set>
#include<map>
#include<iomanip>
//#include<bits/stdc++.h>


using namespace std;



int main(){
	int a,b,c,d,e,f;
	scanf("%d.%d.%d.",&a,&b,&c);
	scanf("%d.%d.%d.",&d,&e,&f);
	c+=b*10+a*100;
	f+=e*10+d*100;
	if(c>f)cout<<"YES"<<endl;
	else cout<<"NO"<<endl;


	return 0;
}