import java.net.*;
import java.io.*;

public class EchoServer 
{
    public  void start(int port) throws IOException
    {
        ServerSocket serverSocket = new ServerSocket(port);
        Socket clientSocket = serverSocket.accept();
        PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);
        BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
        
        String inputLine;
        while ((inputLine = in.readLine()) != null) 
        {
            if (".".equals(inputLine)) 
            {
            out.println("good bye");
            break;
            }
            out.println(inputLine);
        }
    }
    
    public static void main(String args[]) throws IOException
    {
      EchoServer es = new EchoServer();
      es.start(4444);
    }
}