import java.io.*;
class no69
{
    public static void main(String args[])throws IOException
    {
	BufferedReader sc=new BufferedReader(new InputStreamReader(System.in));
	String a,b;
	a=sc.readLine();
	b=sc.readLine();
	int alpha[]=new int[26];
	for(int i=0;i<a.length();i++)
	    {
		alpha[a.charAt(i)-'a']++;
		alpha[b.charAt(i)-'a']++;
	    }
	boolean flag=true;
	for(int i=0;i<26;i++)if(alpha[i]%2!=0)flag=false;
	if(flag)System.out.println("YES");
	else System.out.println("NO");
    }
}