print("Hello, ESP32!")

from machine import Pin
from time import sleep

LEDA = Pin(21, Pin.OUT)
LEDB = Pin(19, Pin.OUT)
LEDC = Pin(18, Pin.OUT)

while True:
  LEDA.value(1)
  LEDB.value(0)
  LEDC.value(0)
  sleep(0.5)
  LEDB.value(1)
  LEDA.value(0)
  LEDC.value(0)
  sleep(0.5)
  LEDC.value(1)
  LEDA.value(0)
  LEDB.value(0)
  sleep(0.5)