import java.util.*;

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