import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = Integer.parseInt(sc.next());
		sc.close();

		if ( 10 <= N && N <= 99 ) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
}