using System;

using System.Linq;

using System.Text;

using System.Text.RegularExpressions;

​

public static class StringExtensions

{

    public static string Repeat(this string @this, int count)

    {

        if (String.IsNullOrWhiteSpace(@this))

        {

            return @this;

        }

​

        return (new StringBuilder(@this.Length * count)).Insert(0, @this, count).ToString();

    }

}

​

public class Program

{

    public static void Main()

    {

        do

        {

            var prompt = "Please Enter in a Fullname: ";

            Console.Write(prompt);

            var name = Console.ReadLine();

            var result = String.Join("", Regex.Matches(name, @"\b(\w{1})").OfType<Match>().Select(match => match.Groups[1].Value));

            Console.WriteLine($"Initials: {result}");

            Console.WriteLine(String.Empty);

            Console.WriteLine("-".Repeat($"{prompt}{name}".Length));

            Console.WriteLine(String.Empty);

        }

        while (true);

    }

}