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

public class Main{
	public static void main(String[] args){
		Scanner sc=new Scanner(System.in);
		while(sc.hasNext()){
			char[] c1=(sc.next()).toCharArray();
			char[] c2=(sc.next()).toCharArray();
			Arrays.sort(c1); Arrays.sort(c2);
			boolean flag=true;
			for(int i=0;i<c1.length;i++){
				if(c1[i]!=c2[i]){
					System.out.println("NO");
					flag=false;
					break;
				}
			}
			if(flag) System.out.println("YES");
		}
	}
}