LastDigit

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

namespace ConsoleApplication7
{
    class Program
    {

        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            Console.WriteLine(ReturnDigit(n));
        }
       private static string ReturnDigit(int number)
    {
        string[] digits = { "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine" };
        int lastDigit = number % 10;
        for (int i = 0; i < digits.Length; i++)
        {
            if (lastDigit == i)
            {
                return digits[i];
            }
        }
        return null;
    }
    }
}