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

namespace num2string_100v2_SC_SoftUni_home
{
    class Program
    {
        static void Main(string[] args)
        {

          var n = int.Parse(Console.ReadLine());
          string[] a = new string[] { "one", "two", "three", "four", "five", "six", "seven", "eight", "nine","ten" };
          string[] b = new string[] {"","eleven","twelve","thirteen","fourteen","fifteen","sixteen","seventeen","eighteen","nineteen"};
          string[] c = new string[] { "", "", "twenty", "thirty", "fourty", "fifty", "sixty", "seventy", "eighty", "ninety" };
          string[] d = new string[] { "hundred" };
          int check1 = (n / 10) % 10;
          int check2 = (n % 10);
          if (n >= 0 && n <= 100)
            {
                if (n >= 0 && n < 10)
                {
                    if (n == 0)
                    {
                        Console.WriteLine("zero");
                    }
                    else {
                        string one = a[n - 1];
                        Console.WriteLine(one);
                    }
                }
                else if (n >= 10 && n < 20)
                {
                    if (n == 10)
                    {
                        string ten = a[n - 1];
                        Console.WriteLine(ten);
                    }
                    else {
                        int dig = n % 10;
                        string two = b[dig];
                        Console.WriteLine(two);
                    }
                }

                else if (check1 != 0 && check2 == 0)
                {
                    int digit = n / 10;
                    string three = c[digit];
                    Console.WriteLine(three);
                }

                else if (n > 20 && n % 10 != 0)
                {
                    int dig1 = n % 10;
                    int dig2 = n /= 10;
                    string four = c[dig2];
                    string five = a[dig1 - 1];
                    Console.WriteLine("{0} {1}", four, five);
                }

                else if (n == 100)
                {
                    int dig1 = n % 10;
                    int dig2 = n /= 100;
                    string seven = d[dig2 - 1];
                    string six = a[dig1];
                    Console.WriteLine("{0} {1}", six, seven);
                }

            }
            else { Console.WriteLine("invalid number"); }
        }
    }
}