import java.awt.*;
import java.applet.Applet;
import java.awt.event.*;

public class NestedLoops extends Applet
{
   public void paint(Graphics g)
   {
       int x, y;
       y = 20;
       for (int floor = 0;floor<4;floor++)
          {
             x = 0;
             for (int apartment = 0;apartment<5;apartment++)
               {
                  g.drawString("A",x,y);
                  x = x+20;
               }

          y = y+20;
         }
   }
}