from machine import Pin
from time import sleep

ledr = Pin(25, Pin.OUT)
ledy = Pin(26, Pin.OUT)
ledg = Pin(27, Pin.OUT)
while True:
    ledr.value(1)
    sleep(2)
    ledr.value(0)
    ledy.value(1)
    sleep(2)
    ledy.value(0)
    ledg.value(1)
    sleep(2)
    ledg.value(0)