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

public class Monitor {
  // Can listen & send on the same socket:
  private DatagramSocket s;
  private InetAddress hostAddress;
  private byte[] buf = new byte[256];
  private DatagramPacket dp = new DatagramPacket(buf, buf.length);
  private int id, port;

  public Monitor(String port_s, String serverName) {
    try {
      // Auto-assign port number:
      s = new DatagramSocket();
      hostAddress = InetAddress.getByName(serverName);
      port = Integer.parseInt(port_s);
    } catch(UnknownHostException e) {
      System.err.println("Cannot find host");
      System.exit(1);
    } catch(SocketException e) {
      System.err.println("Can't open socket");
      e.printStackTrace();
      System.exit(1);
    } 
    System.out.println("Monitor starting");
  }
  public void sendData() {
    String outMessage = "n";
    // Make and send a datagram:
    byte[] sendData = outMessage.getBytes();
    DatagramPacket request = new DatagramPacket(sendData, sendData.length, hostAddress, port);
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    try {
      while (true) {
        in.readLine();
        s.send(request);
        // Block until it reply is back:
        s.receive(dp);
        // Print out the reply:
        String rcvd = new String(dp.getData(), 0, dp.getLength());
        System.out.println(rcvd);
      }
    } catch(IOException e) {
      e.printStackTrace();
      System.exit(1);
    }
  }
  public static void main(String[] args) {
      new Monitor(args[0], args[1]).sendData();
  }
}