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();
        
        char[] array_a=a.toCharArray();
        char[] array_b=b.toCharArray();
        
        Arrays.sort(array_a);
        Arrays.sort(array_b);
        
        a=new String(array_a);
        b=new String(array_b);
        
        //System.out.println(a+" "+b);
        
        if(a.equals(b)){
            System.out.println("YES");
        }else{
            System.out.println("NO");
        }
    }
}