Arrange Numbers

using System;
using System.Text;

public class ArrangeNumbers
{
    public static void Main()
    {
        string[] dict = { "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine" };

        string[] numbersAsDigits = Console.ReadLine()
            .Split(new[] { ',', ' ' }, StringSplitOptions.RemoveEmptyEntries);

        string[] numbersAsWords = ConvertNumbersToWords(numbersAsDigits, dict);
        Array.Sort(numbersAsWords);

        int index = 0;
        foreach (var number in numbersAsWords)
        {
            numbersAsDigits[index++] = ConvertWordToNumber(number, dict);
        }

        Console.WriteLine(string.Join(", ", numbersAsDigits));
    }

    private static string ConvertWordToNumber(string number, string[] dict)
    {
        string[] words = number.Split('-');

        StringBuilder numberAsDigits = new StringBuilder();

        foreach (var word in words)
        {
            numberAsDigits.Append(Array.IndexOf(dict, word));
        }

        return numberAsDigits.ToString();
    }

    private static string[] ConvertNumbersToWords(string[] numbersAsDigits, string[] dict)
    {
        string[] result = new string[numbersAsDigits.Length];

        int index = 0;
        foreach (var number in numbersAsDigits)
        {
            string currentNumberAsString = ConvertNumber(number, dict);
            result[index++] = currentNumberAsString;
        }

        return result;
    }

    private static string ConvertNumber(string number, string[] dict)
    {
        string[] digits = new string[number.Length];

        for (int i = 0; i < number.Length; i++)
        {
            digits[i] = dict[number[i] - '0'];
        }

        return string.Join("-", digits);
    }
}