import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;

public class Tester2 {
	public static void main(String[] args){
		try(BufferedReader br = new BufferedReader(new InputStreamReader(System.in))){
			char[] a = br.readLine().toCharArray();
			char[] b = br.readLine().toCharArray();
			Arrays.sort(a);
			Arrays.sort(b);
			System.out.println(Arrays.equals(a, b)?"YES":"NO");
		}catch(IOException e) {
			e.printStackTrace();
		}
	}
}