English_Name_of_Last_Digit

using System;

namespace English_Name_of_Last_Digit
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = Console.ReadLine();
            LastLetterAsDigit(input);
        }
        public static void LastLetterAsDigit(string input)
        {
            string last = input.Substring(input.Length - 1,1);
            int output = Convert.ToInt32(last);
            switch (output)
            {
                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("");
                    break;
            }
        }
    }
}