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

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String a = sc.next();
		String b = sc.next();
		char[] s1 = a.toCharArray();
		char[] s2 = b.toCharArray();
		Arrays.sort(s1); Arrays.sort(s2);
		for(int i = 0 ; i < a.length() ; i++) {
			if(s1[i] != s2[i]) {
				System.out.println("NO");
				return;
			}
		}
		System.out.println("Yes");
 	}
}