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

public class Main {
	
	// xor の性質 (X ^ Y) ^ X = Y より, F0, F1, F0 ^ F1, F0, F1, ... とループする.
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		final String A = sc.next();
		final String B = sc.next();
		
		final int SIZE = 26;
		int[] A_count = new int[SIZE];
		int[] B_count = new int[SIZE];
		
		for(char c : A.toCharArray()){
			A_count[c - 'a']++;
		}
		for(char c : B.toCharArray()){
			B_count[c - 'a']++;
		}
		
		boolean ok = true;
		for(int i = 0; i < SIZE; i++){
			if(A_count[i] != B_count[i]){
				ok = false;
				break;
			}
		}
		
		System.out.println(ok ? "YES" : "NO");
	}
	
}