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

public class EchoServer {
    public static void main(String[] args) throws IOException {
	  int port = 4000;

        ServerSocket serverSocket = null;
	
        try {
            serverSocket = new ServerSocket(port);
        } catch (IOException e) {
            System.err.println("Could not listen on port: " + port);
            System.exit(1);
        }

        Socket clientSocket = null;
        try {
            clientSocket = serverSocket.accept();
        } catch (IOException e) {
            System.err.println("Accept failed.");
            System.exit(1);
        }

        PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);
        BufferedReader in = new BufferedReader(
				new InputStreamReader(
				clientSocket.getInputStream()));
        String inputLine, outputLine;

        while ((inputLine = in.readLine()) != null) {
		 System.out.println("Primljena poruka: " + inputLine);
             outputLine = "done " + inputLine;
             out.println(outputLine);
             if (inputLine.equals("end"))
                break;
        }
        out.close();
        in.close();
        clientSocket.close();
        serverSocket.close();
    }
}