import java.io.*;
import java.util.Scanner;

class Test{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String str1 = sc.next(), str2 = sc.next();

        String[] a = str1.split("\\.");
        String[] b = str2.split("\\.");
        for(int i=0; i<3; i++){
            int tmp1=Integer.parseInt(a[i]), tmp2 = Integer.parseInt(b[i]);
            if(tmp1 > tmp2){
                System.out.println("YES");
                return;
            }
            if(tmp1 < tmp2){
                System.out.println("NO");
                return;
            }
        }
        System.out.println("YES");
    }
}