import java.util.*;

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);
		System.out.println(String.valueOf(a).equals(String.valueOf(b))?"YES":"NO");
		
	}
}