from machine import Pin
import time

#variable declaration
keve_RED=1
fab_YELLOW=5
john_GREEN=9
red=Pin(keve_RED,Pin.OUT)
yellow=Pin(fab_YELLOW,Pin.OUT)

green=Pin(john_GREEN,Pin.OUT)

while True:
 red.value(1)
 time.sleep(1)
 red.value(0)
 yellow.value(1)
 time.sleep(1)
 yellow.value(0)
 green.value(1)
 time.sleep(1)
 green.value(0)