English name of last digit

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

namespace _03.englishNameOfLastDigit
{
    class Program
    {
        static void Main(string[] args)
        {
            var number = long.Parse(Console.ReadLine());
            string name = number.ToString();
            string result = name[name.Length - 1].ToString();
            string whatToPrint = ReturnNames(result);
            Console.WriteLine(whatToPrint);
        }

        public static string ReturnNames(string number)
        {
            string itsName = "";
            if (string.Equals(number, "1") || string.Equals(number, "-1"))
            {
                itsName = "one";
            }
            else if (string.Equals(number, "2") || string.Equals(number, "-2"))
            {
                itsName = "two";
            }
            else if (string.Equals(number, "3") || string.Equals(number, "-3"))
            {
                itsName = "three";
            }
            else if (string.Equals(number, "4") || string.Equals(number, "-4"))
            {
                itsName = "four";
            }
            else if (string.Equals(number, "5") || string.Equals(number, "-5"))
            {
                itsName = "five";
            }
            else if (string.Equals(number, "6") || string.Equals(number, "-6"))
            {
                itsName = "six";

            }
            else if (string.Equals(number, "7") || string.Equals(number, "-7"))
            {
                itsName = "seven";
            }
            else if (string.Equals(number, "8") || string.Equals(number, "-8"))
            {
                itsName = "eight";
            }
            else if (string.Equals(number, "9") || string.Equals(number, "-9"))
            {
                itsName = "nine";
            }
            else if (string.Equals(number, "0"))
            {
                itsName = "null";
            }
            else
            {
                itsName = "wrong";
            }
            return itsName;
        }
    }
}