using System;
class Number0TO100ToText
{
    static void Main(string[] args)
    {
        int number = int.Parse(Console.ReadLine());
        if (number >= 0 && number <= 9)
        {
            switch (number)
            {
                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: break;
            }
        }
        else if (number >= 10 && number <= 19)
        {
            switch (number)
            {
                case 10: Console.WriteLine("ten"); break;
                case 11: Console.WriteLine("eleven"); break;
                case 12: Console.WriteLine("twelve"); break;
                case 13: Console.WriteLine("thirteen"); break;
                case 14: Console.WriteLine("fourteen"); break;
                case 15: Console.WriteLine("fifteen"); break;
                case 16: Console.WriteLine("sixteen"); break;
                case 17: Console.WriteLine("seventeen"); break;
                case 18: Console.WriteLine("eighteen"); break;
                case 19: Console.WriteLine("nineteen"); break;
                default: break;
            }
        }
        else if (number == 10 || number == 20 || number == 30 || number == 40 || number == 50 ||
                 number == 60 || number == 70 || number == 80 || number == 90)
        {
            switch (number)
            {
                case 10: Console.WriteLine("ten"); break;
                case 20: Console.WriteLine("twenty"); break;
                case 30: Console.WriteLine("thirty"); break;
                case 40: Console.WriteLine("fourty"); break;
                case 50: Console.WriteLine("fifty"); break;
                case 60: Console.WriteLine("sixty"); break;
                case 70: Console.WriteLine("seventy"); break;
                case 80: Console.WriteLine("eighty"); break;
                case 90: Console.WriteLine("ninety"); break;
                default: break;
            }
        }
        else if (number >= 21 && number <= 99)
        {
            int firstDigit = number / 10;
            int secondDigit = number % 10;

            switch (firstDigit)
            {
                case 2: Console.Write("twenty "); break;
                case 3: Console.Write("thirty "); break;
                case 4: Console.Write("fourty "); break;
                case 5: Console.Write("fifty "); break;
                case 6: Console.Write("sixty "); break;
                case 7: Console.Write("seventy "); break;
                case 8: Console.Write("eighty "); break;
                case 9: Console.Write("ninety "); break;
                default: break;
            }
            switch (secondDigit)
            {
                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: break;
            }
        }
        else if (number == 100)
        {
            Console.WriteLine("one hundred");
        }
        else if (number < 0 || number > 99)
        {
            Console.WriteLine("invalid number");
        }
    }
}