#include <iostream>
#include <cstdio>
#include <cmath>
using namespace std;

int main(){
	int a,b,c;
	int d,e,f;
	bool flag=false;
	scanf("%d.%d.%d",&a,&b,&c);
	scanf("%d.%d.%d",&d,&e,&f);
	if(a>d)flag = true;
	else if(a==d){
		if(b>e)flag = true;
		else if(b==e){
			if(d>f)flag = true;
			else if(d==f)flag = true;
		}
	}
	if(flag)cout << "YES" << endl;
	else cout << "NO" <<endl;
}