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.Replace('-', '+');
builder.Remove(0, 10);
builder.Insert(0, new string('-', 10));
Console.WriteLine(builder);
Console.WriteLine("First Char: " + builder[0]);
}