import java.util.ArrayList;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.Scanner;
import java.util.TreeSet;

public class Main {
	
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		final String[] olds = sc.next().split("\\.");
		final String[] curs = sc.next().split("\\.");
		
		boolean old = true;
		for(int i = 0; i < 3; i++){
			final int old_ver = Integer.parseInt(olds[i]);
			final int cur_ver = Integer.parseInt(curs[i]);
			
			if(old_ver < cur_ver){
				old = false;
				break;
			}else if(old_ver > cur_ver){
				old = true;
				break;
			}
		}
		
		System.out.println(old ? "YES" : "NO");
		
	}
}