// Exception handling has been omitted for the sake of brevity
class EchoServer { 
  public static void main(String[] args) throws IOException { 
    ServerSocket serverSocket = new ServerSocket(10007); 
    Socket socket = serverSocket.accept();
			
    PrintWriter out = new PrintWriter(socket.getOutputStream(), true); 
    BufferedReader in = new BufferedReader(
      new InputStreamReader(socket.getInputStream())); 

    String inputLine; 
    while ((inputLine = in.readLine()) != null) { 
      System.out.println(inputLine); 
      out.println(inputLine); 
    }
      
    // close out, in, socket (preferably in a try-finally block)   
  }
}

class EchoClient {
  public static void main(String[] args) throws IOException { 
    Socket socket = new Socket("localhost", 9999);
						
    PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
    BufferedReader in = new BufferedReader(
      new InputStreamReader(socket.getInputStream()));

    BufferedReader stdIn = new BufferedReader(
      new InputStreamReader(System.in));
			
    String userInput;
    while ((userInput = stdIn.readLine()) != null) {
      out.println(userInput);
      System.out.println(in.readLine());
    } 

    // close out, in, stdIn, socket (preferably in a try-finally block)   
  }
}