EngNameOfTheLastDigit

using System;
using System.Collections.Generic;
using System.Linq;
using System.Numerics;
using System.Text;
using System.Threading.Tasks;

namespace _31.EngNameOfTheLastDigit
{
    class Program
    {
        static void Main()
        {
            try
            {
                ulong num = ulong.Parse(Console.ReadLine());
                GetLastDigit(num);
            }
            catch (FormatException)
            {
                Console.WriteLine("Error");
            }
        }

        static void GetLastDigit(ulong num)
        {
            ulong lastNum = (num % 10);
            switch ((lastNum))
            {
                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;
            }

        }
    }
}