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

public class No69 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		
		char[] a=sc.next().toCharArray();
		char[] b=sc.next().toCharArray();
		
		Arrays.sort(a);
		Arrays.sort(b);
		boolean t=true;
		
		for(int i=0; i<a.length; i++){
			if(a[i] != b[i]) t=false;
		}
		
		if(t)
			System.out.println("YES");
		else
			System.out.println("NO");
	

	}

}