import javax.imageio.*;
import java.awt.image.*;
import java.awt.*;
import java.security.NoSuchAlgorithmException;
import java.security.MessageDigest;
import java.lang.reflect.*;
import java.net.*;
import java.io.*;
import javax.swing.*;
import java.util.concurrent.*;
import java.util.regex.*;
import java.util.List;
import java.util.zip.*;
import java.util.*;

public class main {
  static String helloString;
  static String programID; // filled by JavaX
  static int port; // use random port
  
  public static void main(String[] args) throws Exception {
    helloString = "Hello. This is #" + programID; // my hello string
    port = installHelloMessage(helloString);
    print("Hello world. Sleeping. Port=" + port);
    sleep();
  }

// returns port number
static int installHelloMessage(final String helloString) { try {
 
  final ServerSocket serverSocket = new ServerSocket(0);
  int port = serverSocket.getLocalPort();
  
  //serverSocket.setSoTimeout(1000);
  
  Thread _t = new Thread() {
public void run() {
try {
 // todo: higher priority
    while (true) {
      try {
        final Socket s = serverSocket.accept();
        print("connect");
        Thread _t = new Thread() {
public void run() {
try {

          try {
            Writer w = new OutputStreamWriter(s.getOutputStream(), "UTF-8");
            w.write(helloString + "\n");
            w.close();
            //s.close(); // rather wait for client to disconnect.
          } finally {
            print("disconnect");
          }
        } catch (Exception _e) {
  throw _e instanceof RuntimeException ? (RuntimeException) _e : new RuntimeException(_e); } }
};
_t.start();
      } catch (SocketTimeoutException e) {
      }
    }
  } catch (Exception _e) {
  throw _e instanceof RuntimeException ? (RuntimeException) _e : new RuntimeException(_e); } }
};
_t.setDaemon(true);
_t.start();
  
  return port;

} catch (Throwable __e) { throw __e instanceof RuntimeException ? (RuntimeException) __e : new RuntimeException(__e); }}

static void sleep(long ms) {
  try {
    Thread.sleep(ms);
  } catch (Exception e) { throw new RuntimeException(e); }
}

static void sleep() { try {
 
  synchronized(main.class) { main.class.wait(); }

} catch (Throwable __e) { throw __e instanceof RuntimeException ? (RuntimeException) __e : new RuntimeException(__e); }}

static void print() {
  System.out.println();
}

static void print(Object o) {
  System.out.println(o);
}

static void print(long i) {
  System.out.println(i);
}
}