using System;

public class Program

{

    public static void Main()

    {

        char ch;

        Console.WriteLine("Enter an alphabet: ");

        ch = Convert.ToChar(Console.ReadLine());

        switch (Char.ToLower(ch))

        {

            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.Write("Not a vowel");

                    break;  

        }

    }

}