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

namespace _18.NumbersToWords
{
    class numsTOwords
    {
        static void Main(string[] args)
        {
            int number = int.Parse(Console.ReadLine());
            string words="";
            string[] ones = { "zero","one", "two", "three", "four", "five", "six", "seven", "eight", "nine" };
            string[] teens = { "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen" };
            string[] tens = {"ten","twenty","thirty","fourty","fifty","sixty","seventy","eighty","ninety"};
            if (number<0)
            {
                Console.WriteLine("Invalid number");
            }
            else if (number>100)
            {
                Console.WriteLine("invalid number");
            }
            else if (number==100)
            {
                Console.WriteLine("one hundred");
            }
            else if (number<10)
            {
                words += ones[number];
                Console.WriteLine(words);
            }
            else if (number % 10 == 0)
            {
                words += tens[(number / 10) - 1];
                Console.WriteLine(words);
            }
            else if (number<20)
            {
                words += teens[number - 11];
                Console.WriteLine(words);
            }
            else
            {
                int i = number / 10;
                var j = number % 10;
                words += tens[i - 1] + " "+ones[j];
                Console.WriteLine(words);
            }
        }
    }
}