import java.util.*;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		String A = sc.next();
		String B = sc.next();
		
		char[] charA = A.toCharArray();
		char[] charB = B.toCharArray();
		
		Arrays.sort(charA);
		Arrays.sort(charB);
		
		if(String.valueOf(charA).equals(String.valueOf(charB))) {
			System.out.println("YES");
		} else {
			System.out.println("NO");
		}
	}
}