```python
# click within the image and press
# the left and right mouse buttons to
# change the value of the rectangle
def draw():
if py5.is_mouse_pressed and py5.mouse_button == py5.LEFT:
py5.fill(0)
elif py5.is_mouse_pressed and py5.mouse_button == py5.RIGHT:
py5.fill(255)
else:
py5.fill(126)
py5.rect(25, 25, 50, 50)
```