using System;
using System.Collections.Generic;
class Program
{
    static void Main(string[] args)
    {
        int value;
        var num = int.Parse(Console.ReadLine());
        string numToString = num.ToString();

        if (num<0||num>100)
        {
            Console.WriteLine("invalid number");
        }
        else if (num>=0||num<=100)
        {
            var dict = new Dictionary<string, Dictionary<int, string>>();
            dict.Add("NumToText", new Dictionary<int, string>()
            {
                { 0, "zero"},
                { 1, "one"},
                { 2, "two"},
                { 3, "three"},
                { 4, "four"},
                { 5, "five"},
                { 6, "six"},
                { 7, "seven"},
                { 8, "eight"},
                { 9, "nine"},
                { 10, "ten"},
                { 11, "eleven"},
                { 12, "twelve"},
                { 13, "thirteen"},
                { 14, "fourteen"},
                { 15, "fifteen"},
                { 16, "sixteen"},
                { 17, "seventeen"},
                { 18, "eighteen"},
                { 19, "nineteen"},
                { 20, "twenty"},
                { 30, "thirty"},
                { 40, "fourty"},
                { 50, "fifty"},
                { 60, "sixty"},
                { 70, "seventy"},
                { 80, "eighty"},
                { 90, "ninety"},
                { 100, "one hundred"}
            });
            if (num <= 20 || num == 0)
            {
                Console.WriteLine(dict["NumToText"][num]);
            }
            else if (num > 20 && num < 30)
            {
                value = num % 10;
                Console.WriteLine(dict["NumToText"][20] + " " + dict["NumToText"][value]);
            }
            else if (num > 30 && num < 40)
            {
                value = num % 10;
                Console.WriteLine(dict["NumToText"][30] + " " + dict["NumToText"][value]);
            }
            else if (num > 40 && num < 50)
            {
                value = num % 10;
                Console.WriteLine(dict["NumToText"][40] + " " + dict["NumToText"][value]);
            }
            else if (num > 50 && num < 60)
            {
                value = num % 10;
                Console.WriteLine(dict["NumToText"][50] + " " + dict["NumToText"][value]);
            }
            else if (num > 60 && num < 70)
            {
                value = num % 10;
                Console.WriteLine(dict["NumToText"][60] + " " + dict["NumToText"][value]);
            }
            else if (num > 70 && num < 80)
            {
                value = num % 10;
                Console.WriteLine(dict["NumToText"][70] + " " + dict["NumToText"][value]);
            }
            else if (num > 80 && num < 90)
            {
                value = num % 10;
                Console.WriteLine(dict["NumToText"][80] + " " + dict["NumToText"][value]);
            }
            else if (num > 90 && num < 100)
            {
                value = num % 10;
                Console.WriteLine(dict["NumToText"][90] + " " + dict["NumToText"][value]);
            }
            else if (num == 90 || num == 80 || num == 70 || num == 60 || num == 50 || num == 40 || num == 30 || num == 20)
            {
                Console.WriteLine(dict["NumToText"][num]);
            }
            else if (num == 100)
            {
                Console.WriteLine(dict["NumToText"][num]);
            }
        }

        else if (num > 100)
        {
            Console.WriteLine("invalid number");
        }
    }
}