Codehire Cup Skeleton Code for C#

Challenge.cs

public class Challenge
    {
        public static void Main()
        {
            Console.WriteLine("Enter String Name");
            string inputString = Console.ReadLine();
            string alphabet = new String(inputString.Where(Char.IsLetter).ToArray());
            int vowel = CountVowels(alphabet);
            int consonants = CountConsonants(alphabet);         
            Console.WriteLine("{0}vowels:{1},consonants:{2}{3}", "{", vowel, consonants, "}");
            Console.Read();
        }

       public static int CountVowels(string value)
        {
            const string vowels = "aeiou";
            return value.Count(chr => vowels.Contains(char.ToLowerInvariant(chr)));
        }
       public static int CountConsonants(string value)
        {
            const string vowels = "aeiou";
            return value.Count(chr => !vowels.Contains(char.ToLowerInvariant(chr)));
        }
    }