import java.util.*;
import java.util.Arrays;
class test{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		String A = sc.next();
		char[] a = A.toCharArray();
		String B = sc.next();
		char[] b = B.toCharArray();
		
		Arrays.sort(a);
		Arrays.sort(b);

		String s1 = new String(a);
		String s2 = new String(b);
		
		if(s1.equals(s2)){
			System.out.println("YES");
		}
		else{
			System.out.println("NO");
		}
	}
}