using System;

namespace ConsoleApp2
{
    class Program
    {
        static void Main(string[] args)
        {
            int num = int.Parse(Console.ReadLine());

            int tens = num / 10;
            int ones = num % 10;

            string firstWord = string.Empty;
            string secondWord = string.Empty;

            if ((tens == 0) && (num >= 0) && (num <=9))
            {
                switch (ones)
                {
                    case 0: secondWord = "zero"; break;
                    case 1: secondWord = "one"; break;
                    case 2: secondWord = "two"; break;
                    case 3: secondWord = "three"; break;
                    case 4: secondWord = "four"; break;
                    case 5: secondWord = "five"; break;
                    case 6: secondWord = "six"; break;
                    case 7: secondWord = "seven"; break;
                    case 8: secondWord = "eight"; break;
                    case 9: secondWord = "nine"; break;
                }
                Console.WriteLine(secondWord);
            }
            if ((tens == 1) && (num >= 10) && (num <=19))
            {
                switch (ones)
                {
                    case 0: secondWord = "ten"; break;
                    case 1: secondWord = "eleven"; break;
                    case 2: secondWord = "twelve"; break;
                    case 3: secondWord = "thirteen"; break;
                    case 4: secondWord = "fourteen"; break;
                    case 5: secondWord = "fifteen"; break;
                    case 6: secondWord = "sixteen"; break;
                    case 7: secondWord = "seventeen"; break;
                    case 8: secondWord = "eighteen"; break;
                    case 9: secondWord = "nineteen"; break;
                }
                Console.WriteLine(secondWord);
                //Console.WriteLine(tens);
            }
            if ((num >= 20) && (num <= 99))
            {
                if (tens == 2)
                {
                    firstWord = "twenty";
                }
                else if (tens == 3)
                {
                    firstWord = "thirty";
                }
                else if (tens == 4)
                {
                    firstWord = "forty";
                }
                else if (tens == 5)
                {
                    firstWord = "fifty";
                }
                else if (tens == 6)
                {
                    firstWord = "sixty";
                }
                else if (tens == 7)
                {
                    firstWord = "seventy";
                }
                else if (tens == 8)
                {
                    firstWord = "eighty";
                }
                else if (tens == 9)
                {
                    firstWord = "ninety";
                }
                if (ones == 1)
                {
                    secondWord = " one";
                }
                else if (ones == 2)
                {
                    secondWord = " two";
                }
                else if (ones == 3)
                {
                    secondWord = " three";
                }
                else if (ones == 4)
                {
                    secondWord = " four";
                }
                else if (ones == 5)
                {
                    secondWord = " five";
                }
                else if (ones == 6)
                {
                    secondWord = " six";
                }
                else if (ones == 7)
                {
                    secondWord = " seven";
                }
                else if (ones == 8)
                {
                    secondWord = " eight";
                }
                else if (ones == 9)
                {
                    secondWord = " nine";
                }

                Console.WriteLine(firstWord + secondWord);
            }
            if (num == 100)
                {
                   Console.WriteLine("one hundred");
                }
            //if ((num < 0) && (num > 100))
            //{
            //    Console.WriteLine("Invalid number");
            //}
        }
    }
}