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

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

		char[] c1 = sc.next().toCharArray(), c2 = sc.next().toCharArray();
		Arrays.sort(c1);
		Arrays.sort(c2);
		for(int i = 0; i < c1.length; i++){
			if(c1[i] != c2[i]){
				System.out.println("NO");
				return;
			}
		}
		System.out.println("YES");
	}
}