using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter a Character: ");

        string userInput = Console.ReadLine();

        if (char.TryParse(userInput, out char letter))

        {

            switch (letter)

        {

            case 'a':

                Console.WriteLine("Vowel");

                break;

            case 'e':

                Console.WriteLine("Vowel");

                break;

            case 'i':

                Console.WriteLine("Vowel");

                break;

            case 'o':

                Console.WriteLine("Vowel");

                break;

            case 'u':

                Console.WriteLine("Vowel");

                break;

            default:

                Console.WriteLine("Consonant");

                break;

        }

        }

        else

            Console.WriteLine("Enter just a character.");

    }

}

​