import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Scanner;
public class No0069 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String a = sc.nextLine();
		String b = sc.nextLine();
		List<String> aList = new ArrayList<String>();
		List<String> bList = new ArrayList<String>();
		for(int i=0; i<a.length(); i++){
			aList.add(a.substring(i, i+1));
			bList.add(b.substring(i, i+1));
		}
		Collections.sort(aList);
		Collections.sort(bList);
		if(aList.equals(bList)){
			System.out.println("YES");
		}else{
			System.out.println("NO");
		}
	}
}