DEBUG_SD Advanced_MLS11

from microbit import *

x = 0
y = 1
while True:
  display.set_pixel(x, y, 9)

    display.clear()
    x = 0
    y = 0

  if button_a.was_pressed():
    x = x - 1
    if x > 4:
      x = 4

  if button_b.was_pressed():
    y = y - 1
    if x > 4:
      x = 4