using System;

using System.Text;

public class Program

{

    public static void Main()

    {   

        var builder = new StringBuilder();

        builder.Append('-', 10);

        builder.AppendLine();

        builder.Append("Header");

        builder.AppendLine();

        builder.Append('-', 10);

        builder.Replace('-', '+');

        builder.Remove(0, 10);

        builder.Insert(0, new string('-', 10));

        Console.WriteLine(builder);

        Console.WriteLine("First Char: " + builder[0]);

    }

}