import java.util.*;
import java.math.*;
import java.io.*;
 
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		char[] A = sc.next().toCharArray();
		char[] B = sc.next().toCharArray();
		char[] countA = new char[26];
		char[] countB = new char[26];
		for(int i = 0; i < A.length; i++) {
			countA[A[i] - 'a']++; 
		}
		for(int i = 0; i < B.length; i++) {
			countB[B[i] - 'a']++;
		}
		for(int i = 0; i < 26; i++) {
			if(countA[i] != countB[i]) {
				System.out.println("NO");
				return;
			}
		}
		System.out.println("YES");
	}
}