**CheckForAPlayCard

using System;
class CheckForAPlayCard
{
    // CONDITION:
    // Classical play cards use the following signs to designate the card face: 2, 3, 4, 5, 6, 7, 8, 9, 10, J, Q, K and A. Write a program that enters a string and prints “yes” if it is a valid card sign or “no” otherwise.
    static void Main()
    {
        string random = Console.ReadLine();
        int number;

         if (random=="J"||random=="Q"||random=="K"||random=="A")
          {
             Console.WriteLine("yes");
          }
          else if(random == random.ToLower())
          {
              Console.WriteLine("no");
          }
         else
         {
             number = Convert.ToInt32(random);

             if (number == 2|| number == 3|| number == 4 || number == 5 || number == 6 || number == 7|| number == 8 || number == 9)
             {
                 Console.WriteLine("yes");
             }
             else
             {
                 Console.WriteLine("no");
             }
         }

    }
}