using System;

​

public interface IStream

{

    void Write(string data);

}

public class CloudStream: IStream

{

    public virtual void Write(string data)

    {

        Console.WriteLine("Storing " + data);

    }

}

public class CompressedCloudStream: IStream

{

    private readonly IStream _stream;

​

    public CompressedCloudStream(IStream stream)

    {

        _stream = stream;

    }

​

    public void Write(string data)

    {

        var compressed = Compress(data);

        _stream.Write(compressed);

    }

​

    private string Compress(string data)

    {

        return data.Substring(0, 5);

    }

}

public class EncryptedCloudStream: IStream

{

    private IStream _stream;

​

    public EncryptedCloudStream(IStream stream)

    {

        _stream = stream;

    }

​

    public void Write(string data)

    {

        var encrypted = Encrypt(data);

        _stream.Write(encrypted);

    }

​

    private string Encrypt(string data)

    {

        return "!@#$%^^&&*";

    }

}

public class Program

{

    public static void Main()

    {

        var stream = new EncryptedCloudStream(new CompressedCloudStream(new CloudStream()));

        stream.Write("sensitive data");

    }

}