import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        char[] aArr = sc.next().toCharArray();
        Arrays.sort(aArr);
        char[] bArr = sc.next().toCharArray();
        Arrays.sort(bArr);
        if (new String(aArr).equals(new String(bArr))) {
            System.out.println("YES");
        } else {
            System.out.println("NO");
        }
    }
}