import java.util.Arrays;
import java.util.Scanner;

public class Main69 {
	public static void main(String[] args) {
		Main69 p = new Main69();
	}

	public Main69() {
		Scanner sc = new Scanner(System.in);
		String a = sc.next();
		String b = sc.next();
		solve(a, b);
	}

	public void solve(String a, String b) {
		char[] aa = a.toCharArray();
		char[] bb = b.toCharArray();
		
		Arrays.sort(aa);
		Arrays.sort(bb);
		if(new String(aa).equals(new String(bb)))
			System.out.println("YES");
		else
			System.out.println("NO");
	}

}