import java.util.Scanner;
	

public class Main{
	
	
	public static void main(String args[])throws Exception{
		
		Scanner sc = new Scanner(System.in);
		String A = sc.next();
		String B = sc.next();
		int L = A.length();
		char[] a = new char[26];
		char[] b = new char[26];
		for(int i=0;i<L;i++){
			a[A.charAt(i)-'a']++;
			b[B.charAt(i)-'a']++;
		}
		for(int i=0;i<26;i++){
			if(a[i]!=b[i]){
				System.out.println("NO");
				return;
			}
		}
		System.out.println("YES");
	}
}