import java.util.*;

public class Main {
	
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		char s[]=sc.next().toCharArray();
		char t[]=sc.next().toCharArray();
		int S[]=new int[30];
		int T[]=new int[30];
		for(int i=0;i<s.length;i++){
		   int x=s[i]-'a';
		   S[x]++;
		   x=t[i]-'a';
		   T[x]++;
		}
		String ans="YES";
		for(int i=0;i<30;i++){
			if(S[i]!=T[i])ans="NO";
		}
		System.out.println(ans);
	}}