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

namespace _016_Num_0to100
{
    class Program
    {
        static void Main(string[] args)
        {
            int number = int.Parse(Console.ReadLine());
            var onesPlace = "";
            var tensPlace = "";

            int onesPlaceInt = number % 10;
            int tensPlaceInt = number / 10;

            // Get onesPlace name
            if (onesPlaceInt == 0)
            {
            }
            else if (onesPlaceInt == 1)
            {
                onesPlace = "one";
            }
            else if (onesPlaceInt == 2)
            {
                onesPlace = "two";
            }
            else if (onesPlaceInt == 3)
            {
                onesPlace = "three";
            }
            else if (onesPlaceInt == 4)
            {
                onesPlace = "four";
            }
            else if (onesPlaceInt == 5)
            {
                onesPlace = "five";
            }
            else if (onesPlaceInt == 6)
            {
                onesPlace = "six";
            }
            else if (onesPlaceInt == 7)
            {
                onesPlace = "seven";
            }
            else if (onesPlaceInt == 8)
            {
                onesPlace = "eight";
            }
            else
            {
                onesPlace = "nine";
            }

            // Get tens Place Name
            if (tensPlaceInt == 0)
            {
            }
            else if (tensPlaceInt == 1)
            {
                if (onesPlaceInt == 0)
                {
                    tensPlace = "ten";
                }
                else if (onesPlaceInt == 1)
                {
                    tensPlace = "eleven";
                }
                else if (onesPlaceInt == 2)
                {
                    tensPlace = "twelve";
                }
                else if (onesPlaceInt == 3)
                {
                    tensPlace = "thirteen";
                }
                else if (onesPlaceInt == 4)
                {
                    tensPlace = "fourteen";
                }
                else if (onesPlaceInt == 5)
                {
                    tensPlace = "fifteen";
                }
                else if (onesPlaceInt == 6)
                {
                    tensPlace = "sixteen";
                }
                else if (onesPlaceInt == 7)
                {
                    tensPlace = "seventeen";
                }
                else if (onesPlaceInt == 8)
                {
                    tensPlace = "eighteen";
                }
                else
                {
                    tensPlace = "nineteen";
                }
            }
            else if (tensPlaceInt == 2)
            {
                tensPlace = "twenty";
            }
            else if (tensPlaceInt == 3)
            {
                tensPlace = "thirty";
            }
            else if (tensPlaceInt == 4)
            {
                tensPlace = "forty";
            }
            else if (tensPlaceInt == 5)
            {
                tensPlace = "fifty";
            }
            else if (tensPlaceInt == 6)
            {
                tensPlace = "sixty";
            }
            else if (tensPlaceInt == 7)
            {
                tensPlace = "seventy";
            }
            else if (tensPlaceInt == 8)
            {
                tensPlace = "eighty";
            }
            else if (tensPlaceInt == 9)
            {
                tensPlace = "ninety";
            }

            if (number < 0 || number > 100)
            {
                Console.WriteLine("invalid number");
            }
            else if (number == 0)
            {
                Console.WriteLine("zero");
            }
            else if (number == 100)
            {
                Console.WriteLine("one hundred");
            }
            else
            {
                if(tensPlace == "")
                {
                    Console.WriteLine(onesPlace);
                }
                else if (onesPlace == "" || tensPlaceInt == 1)
                {
                    Console.WriteLine(tensPlace);
                }
                else
                {
                    Console.WriteLine("{0} {1}", tensPlace, onesPlace);
                }

            }
        }
    }
}