using System;
using System.Collections.Generic;
using System.Text;

namespace NumWords
{
    class Program
    {

        static String NumWords(double n)
        {
            string[] numbersArr = new string[] { "one", "two", "three", "four", "five", "six", "seven",
                "eight", "nine", "ten", "eleven", "twelve", "thirteen", "fourteen",
                "fifteen", "sixteen", "seventeen", "eighteen", "nineteen" };
            string[] tensArr = new string[] { "twenty", "thirty", "fourty", "fifty",
                "sixty", "seventy", "eighty", "ninty" };
            string[] suffixesArr = new string[] { "thousand" };
            string words = "";

            bool tens = false;

            if (n > 3000)
            {
                Console.WriteLine("o p s tama na sobra na");
                Console.ReadLine();
                Environment.Exit(0);
            }
            if (n == 0) {
                Console.WriteLine("zero");
                Console.ReadLine();
                Environment.Exit(0);
            }
            if (n >= 1000)
            {
                if (n % 1000 > 0) words += NumWords(Math.Floor(n / 1000)) + " thousand, ";
                else words += NumWords(Math.Floor(n / 1000)) + " thousand";
                n %= 1000;
            }
            if (0 <= n && n <= 999)
            {
                if ((int)n / 100 > 0)
                {
                    words += NumWords(Math.Floor(n / 100)) + " hundred";
                    n %= 100;
                }
                if ((int)n / 10 > 1)
                {
                    if (words != "")
                        words += " ";
                    words += tensArr[(int)n / 10 - 2];
                    tens = true;
                    n %= 10;
                }


                if (n < 20 && n > 0)
                {
                    if (words != "" && tens == false)
                        words += " ";
                    words += (tens ? "-" + numbersArr[(int)n - 1] : numbersArr[(int)n - 1]);
                    n -= Math.Floor(n);
                }

            }

            return words;

        }
        static void Main(string[] args)
        {
            Console.Write("input: ");
            Double n = Double.Parse(Console.ReadLine());

            Console.WriteLine("output: " + "{0}", NumWords(n));

            Console.ReadLine();
        }
    }
}