import java.util.*;

public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		char[] a = sc.next().toCharArray();
		char[] b = sc.next().toCharArray();
		Arrays.sort(a);
		Arrays.sort(b);
		boolean F = true;
		for (int i=0; i<a.length; i++) {
			if (a[i]!=b[i]) {F = false;}
		}
		System.out.println(F==true?"YES":"NO");
	}
}