using System;



class Program
{
    static void Main()
    {
        int num = int.Parse(Console.ReadLine());
        int firstNum = num / 10;
        int secondNum = 0;
        int bothNumbers = num;
        if (num >= 0 && num <= 10) secondNum = num;
        else if (num >= 20) secondNum = num % 10;
        string firstWord = "";
        string secondWord = "";
        string bothWords = "";
        switch (firstNum)
        {
            case 2: firstWord = "twenty"; break;
            case 3: firstWord = "thirty"; break;
            case 4: firstWord = "forty"; break;
            case 5: firstWord = "fifty"; break;
            case 6: firstWord = "sixty"; break;
            case 7: firstWord = "seventy"; break;
            case 8: firstWord = "eighty"; break;
            case 9: firstWord = "ninety"; break;
            case 10: firstWord = "one hundred"; break;
            default: break;
        }
        switch (secondNum)
        {
            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;
            default: break;
        }
        switch (bothNumbers)
        {
            case 10: bothWords = "ten"; break;
            case 11: bothWords = "eleven"; break;
            case 12: bothWords = "twelve"; break;
            case 13: bothWords = "thirteen"; break;
            case 14: bothWords = "fourteen"; break;
            case 15: bothWords = "fifteen"; break;
            case 16: bothWords = "sixteen"; break;
            case 17: bothWords = "seventeen"; break;
            case 18: bothWords = "eighteen"; break;
            case 19: bothWords = "nineteen"; break;
            default: break;
        }
        if (num % 10 == 0 && num != 0) secondWord = "";
        if (num >= 0 && num < 10) Console.WriteLine(secondWord);
        else if (num >= 10 && num <= 19) Console.WriteLine(bothWords);
        else if (num >= 20 && num <= 100)
            if (num % 10 == 0) Console.WriteLine(firstWord);
            else Console.WriteLine(firstWord + " " + secondWord);
        else Console.WriteLine("invalid number");
    }
}