using System;

public class Program

{

    public static void Main()

    {

Console.WriteLine("Maximiliano Jiménez Menchaca");

char symbol;

        Console.Write("Input a symbol: ");

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

        if ((symbol == 'a') || (symbol == 'e') || (symbol == 'i') || 

                (symbol == 'o') || (symbol == 'u'))

            Console.WriteLine("It's a lowercase vowel.");

        else if ((symbol >= '0') && (symbol <= '9'))

            Console.WriteLine("It's a digit.");

        else

            Console.Write("It's another symbol.");        

    }

}

​