import java.util.Scanner;

public class Main{
	public static void main(String[] args){
		Scanner sc=new Scanner(System.in);
		while(sc.hasNext()){
			String[] s0=(sc.next()).split("\\.");
			String[] s1=(sc.next()).split("\\.");
			for(int i=0;i<3;i++){
				int a=Integer.parseInt(s0[i]);
				int b=Integer.parseInt(s1[i]);
				if(a>b){
					System.out.println("YES");
					break;
				}
				else if(b>a){
					System.out.println("NO");
					break;
				}
				if(i==2) System.out.println("YES");
			}
		}
	}
}