public static void Main()
Console.WriteLine("Karla Rojas");
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.");
Console.Write("It's another symbol.");