import java.io.*;
import java.util.*;

class Main69 {
	
	public static char[] getCharSeq (String s) {
		char[] ret = new char[26];
		for (int i = 0; i < s.length(); i++)
			ret[(int)s.charAt(i) - 97]++;
		return ret;
	}
	
	public static void main (String[] args) throws IOException {
		BufferedReader br = 
			new BufferedReader(new InputStreamReader(System.in));
		
		String a = br.readLine();
		String b = br.readLine();
		
		System.out.println(Arrays.equals(getCharSeq(a),getCharSeq(b)) ? "YES" : "NO");
	}
}