import java.util.Scanner;
import java.util.Arrays;
public class Moji{
	public static void main(String[] arg){
		Scanner sc = new Scanner(System.in);
		boolean b=true;
		char[] s1 = sc.next().toCharArray();
		char[] s2 = sc.next().toCharArray();
		Arrays.sort(s1);
		Arrays.sort(s2);
		for(int i = 0;i<s1.length;i++){
			if(s1[i] != s2[i])b=false;
		}
		if(b){
			System.out.println("YES");
		}else{
			System.out.println("NO");
		}
	}
}