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

class ClientThread extends Thread {
    private final Socket socket;
    private final BufferedReader in;
    private final PrintWriter out;
    private final Storage storage;

    public ClientThread(Socket s, Storage m) throws IOException {
	socket = s;
	storage = m;
	in = new BufferedReader(
		     new InputStreamReader(
			     socket.getInputStream()));
	out = new PrintWriter(
		      new BufferedWriter(
			      new OutputStreamWriter(
				      socket.getOutputStream())), true);
	start();
    } // ClientThread

    public void run() {
	try {
	    while (true) {
		String inline = in.readLine();
		if (inline == null)
		    break;
		else if (inline.equals("LAGRA")) {
		    String newString = in.readLine();
		    storage.setString(newString);
		    out.println("OK");
		}
		else if (inline.equals("HÄMTA")) {
		    out.println(storage.getString());
		}
		else
		    out.println("NOK");
	    } // while
	} // try
	catch(IOException e) {

	}
    } // run
} // class ClientThread

class Storage {
    private String s;
    public synchronized void setString(String s) {
	this.s = s;
    }
    public synchronized String getString() {
	return s;
    }
} // class Storage

public class MultiServer {
    public static final int PORT = 2000;
    public static void main(String[] args) throws IOException {
	Storage storage = new Storage();
	ServerSocket s = new ServerSocket(PORT);
	while(true) {
	    Socket socket = s.accept();
	    ClientThread t = new ClientThread(socket, storage);
	} // while
    } // main
} // MultiServer