import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class Main {
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		String strA = br.readLine();
		String strB = br.readLine();

		boolean result = Stream.of(strA.split("")).sorted().collect(Collectors.joining())
				.equals(Stream.of(strB.split("")).sorted().collect(Collectors.joining()));

		System.out.println(result ? "YES" : "NO");
	}
}