using System;

public class Program

{

    public static void Main()

    {

          char[] arr = { '2', '3', '4', '5', '6', '7', '8', '9', 'J', 'K', 'A' };

        bool isEqual = false;

​

        var pressedKey = Console.ReadKey();

        char a = Convert.ToChar(pressedKey.Key);

​

        for (int i = 0; i < arr.Length; i++)

        {

            if (arr[i] == a) isEqual = true;

        }

​

        Console.WriteLine(isEqual ? "\nyes" : "\nno");

    }

}