import javax.swing.*; 
import java.awt.*; 
class FlagQuiz {
    public static void main(String[] args) {
	JFrame frame = new JFrame(); 
	Container contentPane = frame.getContentPane(); 

	frame.setSize(400, 400); 
	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
	frame.setVisible(true); 
    }
}