import java.io.*;
import java.util.*;
class Main
{
	public static void main(String args[]) throws Exception
	{
		Scanner cin=new Scanner(System.in);
		String s1,s2;
		int[] n1,n2;
		int i,l;
		n1=new int[26];
		n2=new int[26];
		s1=cin.next();
		s2=cin.next();
		l=s1.length();
		for(i=0;i<26;i++) n1[i]=n2[i]=0;
		for(i=0;i<l;i++)
		{
			n1[s1.charAt(i)-'A']++;
			n2[s2.charAt(i)-'A']++;
		}
		Arrays.sort(n1);
		Arrays.sort(n2);
		for(i=0;i<26;i++)
		{
			if(n1[i]!=n2[i]) break;
		}
		if(i==26) System.out.println("YES");
		else System.out.println("NO");
	}
}