using System;

using System.Text.RegularExpressions;

​

public class HelloWorld

{

    public static void Main(string[] args)

    {

        var text = "ilerna online programacion a 1º semestre 2023";

        var vowelRegex = "[aeiouAEUIO]";

        var numberRegex = "[0-9]"; 

        var consonantRegex = "(?!" + vowelRegex + "|" + numberRegex + ")[A-z]"; 

        Console.WriteLine(Regex.Matches(text, consonantRegex).Count + "\n");

        Console.WriteLine (Regex.Matches(text, numberRegex).Count + "\n");

        Console.WriteLine (Regex.Replace(text, vowelRegex + "|" + numberRegex + "|[ º]", "") + "\n");

    }

}