#include<iostream>
#include<queue>
#include<cstdio>
#include<utility>
#include<algorithm>
#include<cmath>
using namespace std;
int main(){
	int a,b,c,aa,bb,cc;
	scanf("%d.%d.%d",&a,&b,&c);
	scanf("%d.%d.%d",&aa,&bb,&cc);
	if(aa<a){
		cout<<"YES"<<endl;return 0;
	}else if(aa>a){
		cout<<"NO"<<endl;return 0;
	}else{
		if(bb<b){
			cout<<"YES"<<endl;return 0;
		}else if(bb>b){
			cout<<"NO"<<endl;return 0;
		}else{
			if(cc<c){
				cout<<"YES"<<endl;return 0;
			}else if(cc>c){
				cout<<"NO"<<endl;return 0;
			}else{
				cout<<"YES"<<endl;return 0;
			}
		}
	}
}