Reading by Amazing String

AmazingString.cs

namespace AmazingString
{
    class Program
    {       
        private static Random random = new Random();

        static void Main(string[] args)
        {            
            string sentence = "Covariant and contravariant generic type parameters provide greater flexibility in assigning and using generic types";
            string[] wordList = sentence.Split();
            StringBuilder builder = new StringBuilder();
            for (int i = 0; i < wordList.Length; i++)
            {
                wordList[i] = amazingWord(wordList[i]);
                builder.Append(" ");
                builder.Append(wordList[i]);
            }
            Console.WriteLine(builder.ToString());

            Console.ReadKey();
        }

        private static string amazingWord(string word)
        {
            int length = word.Length;           

            if (length > 3)
            {
                char[] wordLetters = word.ToCharArray();
                int count = length - 2;
                while (--count > 0)
                {
                    int k = random.Next() % count;
                    char temp = wordLetters[k + 1];
                    wordLetters[k + 1] = wordLetters[count + 1];
                    wordLetters[count + 1] = temp;
                }
                return new string(wordLetters);
            }
            else
            {
                return word;
            }            
        }
    }
}