using System;

public class Program

{

    public static void Main()

    {

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

        string letter = Console.ReadLine();

        char l;

        Char.TryParse(letter, out l);

        switch(l){

            case 'a':

                Console.WriteLine("Is a vowel");

            break;

            case 'e':

                Console.WriteLine("Is a vowel");

            break;

            case 'i':

                Console.WriteLine("Is a vowel");

            break;

            case 'o':

                Console.WriteLine("Is a vowel");

            break;

            case 'u':

                Console.WriteLine("Is a vowel");

            break;

            default:

                Console.WriteLine("Is a consanant");

            break;

        }

    }

}