using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

​

namespace Opdracht_3._7

{

    class Program

    {

        static void Main(string[] args)

        {

            Console.Write("Schrijf hier je tekst : ");

            string input = Console.ReadLine();

            int val = '*';

            string str = "";

            int len = input.Length;

            char[] ch = input.ToCharArray();

            for (int i = 0; i < len; i++)

            {

                if (ch[i] == 'a' || ch[i] == 'e' || ch[i] == 'i' || ch[i] == 'o' || ch[i] == 'u' || ch[i] == 'A' || ch[i] == 'E' || ch[i] == 'I' || ch[i] == 'O' || ch[i] == 'U')

                {

                    string v = val.ToString();

                    ch[i] = Convert.ToChar('*');

                    str = str + ch[i];

                    val++;

                }

                else

                    str = str + ch[i];

            }

            Console.WriteLine("Dit is je uitkomst:  " + str);

            Console.ReadLine();

        }

    }

}