using System;
namespace P3_3
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(":");
            int x;
            if (!int.TryParse(Console.ReadLine(), out x))		
            {
                Console.WriteLine("Ĳ֣");		
            }
            else
            {
                switch (x/10)
                {
                    case 10:
                        Console.WriteLine("");
                        break;
                    case 9:
                        Console.WriteLine("");
                        break;
                    case 8:
                        Console.WriteLine("");
                        break;
                    case 7:
                        Console.WriteLine("");
                        break;
                    case 6:
                        Console.WriteLine("");
                        break;
                    default: 					
                        Console.WriteLine("");
                        break;
                }
            }
        }
    }
}
