import java.util.HashSet;
import java.util.Scanner;

public class No_69{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		HashSet<String> set = new HashSet<String>();

		String s1,s2,ans,tmp;
		s1 = sc.next();
		s2 = sc.next();
		ans = "YES";
		tmp = "";
		
		if(s1.equals(s2)){
			System.out.println(ans);
			System.exit(0);
		}

		for (int i = 0; i < s1.length(); i++) {
			tmp = s1.substring(i,i+1);
			if(set.add(tmp)){
				continue;
			}
			if (!s2.contains(tmp)){
				ans = "NO";
				break;
			}
		}

		System.out.println(ans);
		sc.close();

	}
}