using System;

using System.Text;

public class Program

{

    public static void Main()

    {

        /*StringBuilder sb = new StringBuilder("Hello World!!",50);

        Console.WriteLine(sb);

        sb.Append("C#");

        Console.WriteLine(sb);

        // sb.AppendLine("This is new line");

        //Console.WriteLine(sb);

        sb.AppendFormat("{0:c}",25);

        Console.WriteLine(sb);

        sb.Insert(20,"hii");

        Console.WriteLine(sb);

        sb.Remove(7,8);

        Console.WriteLine(sb);*/

        StringBuilder sb=new StringBuilder("hello all");

        //sb.Remove(6,3);

        Console.WriteLine(sb);

        sb.Replace("all","hii");

        Console.WriteLine(sb);

    }

}