import digitalio
import board
import time
ledA0 = digitalio.DigitalInOut(board.A0)
ledA1 = digitalio.DigitalInOut(board.A1)
ledA2 = digitalio.DigitalInOut(board.A2)
ledA3 = digitalio.DigitalInOut(board.A3)
ledA0.direction = digitalio.Direction.OUTPUT
ledA1.direction = digitalio.Direction.OUTPUT
ledA2.direction = digitalio.Direction.OUTPUT
ledA3.direction = digitalio.Direction.OUTPUT
ledA0.value = False
ledA1.value = False
ledA2.value = False
ledA3.value = False
while True:
    ledA3.value = True
    ledA0.value = False
    time.sleep(0.5)
    ledA2.value = True
    ledA3.value = False
    time.sleep(0.5)
    ledA1.value = True
    ledA2.value = False
    time.sleep(0.5)
    ledA0.value = True
    ledA1.value = False
    time.sleep(0.5)