import java.util.*;
 

public class Main {
	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String a=sc.next();
		String b=sc.next();
		HashMap<Character,Integer> aa=new HashMap<>();
		HashMap<Character,Integer> bb=new HashMap<>();
		for(int i=0;i<a.length();i++){
			if(!aa.containsKey(a.charAt(i))){
				aa.put(a.charAt(i), 0);
			}else{
				aa.put(a.charAt(i), aa.get(a.charAt(i))+1);
			}
			if(!bb.containsKey(b.charAt(i))){
				bb.put(b.charAt(i), 0);
			}else{
				bb.put(b.charAt(i), bb.get(b.charAt(i))+1);
			}	
		}
		for(Character g:aa.keySet()){
			if(!bb.containsKey(g)||aa.get(g)!=bb.get(g)){
				System.out.println("NO");
				return;
			}
		}
		System.out.println("YES");
	}
}