import java.util.*;
import java.util.zip.*;
import java.util.List;
import java.util.regex.*;
import java.util.concurrent.*;
import java.util.concurrent.atomic.*;
import java.util.concurrent.locks.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
import javax.swing.table.*;
import java.io.*;
import java.net.*;
import java.lang.reflect.*;
import java.lang.ref.*;
import java.lang.management.*;
import java.security.*;
import java.security.spec.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.imageio.*;
import java.math.*;


class main {

public static void main(final String[] args) throws Exception {
  JFrame f = new JFrame();
  f.setUndecorated(true);
  f.setBackground(new Color(0,255,0,0));
  f.setSize(512, 512);
  f.add(new JPanel() {
      @Override
      protected void paintComponent(Graphics g) {
          g.setColor(Color.RED);
          g.drawRect(0, 0, 511, 511);
      }
  });
  f.setLocationRelativeTo(null);
  f.setVisible(true);
}}