Exam08

using System;

namespace Ex08
{
    class Exam08
    {
        static void Main()
        {
            try
            {
                int a = int.Parse(Console.ReadLine());
                switch (a)
                {
                    case 0: Console.WriteLine("Zero"); break;
                    case 1: Console.WriteLine("One"); break;
                    case 2: Console.WriteLine("Two"); break;
                    case 3: Console.WriteLine("Three"); break;
                    case 4: Console.WriteLine("Four"); break;
                    case 5: Console.WriteLine("Five"); break;
                    case 6: Console.WriteLine("Six"); break;
                    case 7: Console.WriteLine("Seven"); break;
                    case 8: Console.WriteLine("Eight"); break;
                    case 9: Console.WriteLine("Nine"); break;
                    default: Console.WriteLine("not a digit");
                        break;
                }
            }
            catch (FormatException)
            {
                Console.WriteLine("not a digit");
            }
        }
    }
}