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

namespace Number0_100_to_Text
{
    class Program
    {
        static void Main(string[] args)
        {
            int number = int.Parse(Console.ReadLine());
            int overage;
            string numberWord = string.Empty;
            string numberWord1 = string.Empty;
            string numberWord2 = string.Empty;
            string numberWord3 = "teen";
            if (number < 0 || number > 100)
            {
                numberWord1 = "Invalid number";
                numberWord2 = string.Empty;
                numberWord3 = string.Empty;
            }
            else if (number == 0)
            {
                numberWord1 = "zero";
                numberWord2 = string.Empty;
                numberWord3 = string.Empty;
            }
            else
            {
                overage = number % 10;
                switch (overage)
                {
                    case 1:
                        numberWord2 = "one";
                        break;
                    case 2:
                        numberWord2 = "two";
                        break;
                    case 3:
                        numberWord2 = "three";
                        break;
                    case 4:
                        numberWord2 = "four";
                        break;
                    case 5:
                        numberWord2 = "five";
                        break;
                    case 6:
                        numberWord2 = "six";
                        break;
                    case 7:
                        numberWord2 = "seven";
                        break;
                    case 8:
                        numberWord2 = "eight";
                        break;
                    case 9:
                        numberWord2 = "nine";
                        break;
                }
                if (number < 10)
                {
                    numberWord1 = string.Empty;
                    numberWord3 = string.Empty;
                }
                else if (number >= 10 && number < 20)
                {
                    switch (number)
                    {
                        case 10:
                            numberWord1 = "ten";
                            break;
                        case 11:
                            numberWord1 = "eleven";
                            break;
                        case 12:
                            numberWord1 = "twelve";
                            break;
                        case 13:
                            numberWord1 = "thirteen";
                            break;
                        case 15:
                            numberWord1 = "fifteen";
                            break;
                        case 14:
                        case 16:
                        case 17:
                        case 18:
                        case 19:
                            numberWord1 = numberWord2 + numberWord3;
                            numberWord2 = string.Empty;
                            numberWord3 = string.Empty;
                            break;
                    }
                    numberWord2 = string.Empty;
                    numberWord3 = string.Empty;
                }
                else if (number >= 20 && number <= 100)
                {
                    switch (number / 10)
                    {
                        case 2:
                            numberWord1 = "twenty ";
                            break;
                        case 3:
                            numberWord1 = "thirty ";
                            break;
                        case 4:
                            numberWord1 = "forty ";
                            break;
                        case 5:
                            numberWord1 = "fifty ";
                            break;
                        case 6:
                            numberWord1 = "sixty ";
                            break;
                        case 7:
                            numberWord1 = "seventy ";
                            break;
                        case 8:
                            numberWord1 = "eighty ";
                            break;
                        case 9:
                            numberWord1 = "ninety ";
                            break;
                        case 10:
                            numberWord1 = "one hundred";
                            numberWord2 = string.Empty;
                            break;
                    }
                    numberWord3 = string.Empty;
                }
            }

            numberWord = numberWord1 + numberWord2 + numberWord3;
            Console.WriteLine(numberWord.Trim());
        }
    }
}