7.2.5

import java.util.Scanner;
public class Main {


    static boolean  Compare(String a,String b)
    {
        if (a.length()!=b.length()) return false;
        for (int i=0,Length=a.length();i<Length;i++)
        {
            if (a.charAt(i)!=b.charAt(i)) return false;
        }
        return true;
    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String a=in.nextLine();
        String b=in.nextLine();
        if (Compare(a,b))  System.out.println("YES");
            else System.out.println("NO");
    }
}