import java.util.HashMap;
import java.util.Scanner;

public class Main{

	static final Scanner s=new Scanner(System.in);

	public static void main(String args[]){
		Counter<Character> a=new Counter<>(26), b=new Counter<>(26);
		for(char c:s.next().toCharArray())
			a.add(c);
		for(char c:s.next().toCharArray())
			b.add(c);

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

class Counter<T>{

	public HashMap<T, Integer> map;

	public Counter(int initSize){
		map=new HashMap<>(initSize);
	}

	public Counter(){
		this(10);
	}

	public void add(T key, int v){
		Integer i;
		if((i=map.get(key))==null){
			map.put(key,v);
		}else{
			map.put(key,i+v);
		}
	}

	public void add(T key){
		add(key,1);
	}
}