#include <iostream>
#include <stdio.h>
using namespace std;
int main(int argc, char* argv[])
{
	int A0,B0,C0;
	int A1,B1,C1;
	fscanf(stdin,"%d.%d.%d",&A0,&B0,&C0);
	fscanf(stdin,"%d.%d.%d",&A1,&B1,&C1);

	if (A0>A1){
		cout<<"YES"<<endl;
		return 0;
	}else if (A0==A1){
		if (B0>B1){
			cout<<"YES"<<endl;
			return 0;
		}else if (B0==B1){
			if (C0>=C1){
				cout<<"YES"<<endl;
				return 0;		
			}
		}
	}
	cout<<"NO"<<endl;
	return 0;
}