import javax.swing.*;
import java.awt.*;

public class Assignment4applet extends JApplet {
    char c='Z';
    
    public void init() {
	String input;
	do {
	    input = JOptionPane.showInputDialog( "Enter a letter" );
	    if ( ! Character.isLetter( input.charAt(0)) &&
		 input.charAt(0)!='#' )
		JOptionPane.showMessageDialog( null, "Must be a letter" );
	} while ( ! Character.isLetter( input.charAt(0)) && input.charAt(0)!='#' );
	
	c = Character.toUpperCase( input.charAt(0) );
	
    }

    public void paint( Graphics g ) {
	g.setFont( new Font( "Courier", Font.BOLD, 20 ) );

	for (int row=0; row<=c-'A'; row++)
	    g.drawString( "                         ".substring(0,c-'A'-row) + 
			  "ABCDEFGHIJKLMNOPQRSTUVWXYZ".substring(0,row+1) +
			  "ZYXWVUTSRQPONMLKJIHGFEDCBA".substring(26-row,26),
			  0, 20*(row+1) );
	
    }
}