using System;

public class Program
{
    static public void Main(string[] args)
    {
        int number = int.Parse(Console.ReadLine());
        string[] shortName = new string[] { "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten", "eleven", "twelve" };
        string[] compositeName = new string[] { "twen", "thir", "four", "fif", "six", "seven", "eigh", "nine" };
        string name = "";

        if ((number < 0) || (number > 100))
            name = "invalid number";
        else if (number < 13)
            name = shortName[number];
        else if (number < 20)
            name = compositeName[number % 10 - 2] + "teen";
        else if (number < 100)
        {
            name = compositeName[number / 10 - 2] + "ty";
            if (number % 10 != 0)
                name += " " + shortName[number % 10];
        }
        else
            name = "one hundred";
        Console.WriteLine(name);
    }
}