import java.awt.*;
import java.awt.event.*;
public class Consume extends Frame 
{
	public TextField tf;

	public Consume()
	{
		tf=new TextField(16);
		tf.addKeyListener(new KeyHandler());
		Panel panel=new Panel();
		panel.add(tf);
		add(panel,BorderLayout.CENTER);
		addWindowListener(new Win());
		setBounds(100,100,500,500);
		setVisible(true);
	}

	class KeyHandler extends KeyAdapter
	{
		public void keyPressed(KeyEvent e)
		{
			if(e.getKeyCode()<KeyEvent.VK_A||e.getKeyCode()>KeyEvent.VK_Z)
			{
				if(e.getKeyCode()!=KeyEvent.VK_DELETE)
					if(e.getKeyCode()!=KeyEvent.VK_BACK_SPACE)
					    e.consume();
			}
		}
	}

	class Win extends WindowAdapter
	{
		public void windowClosing(WindowEvent e)
		{
			System.exit(0);
		}
	}
	public static void main(String[] args) 
	{
		Consume con=new Consume();
	}
}