from machine import Pin
from utime import sleep
ledr =Pin(5,Pin.OUT)
ledy =Pin(6,Pin.OUT)
ledg =Pin(7,Pin.OUT) 
while True :
    ledr.high()
    sleep(10)
    ledr.low()
    ledg.high()
    sleep(20)
    ledg.low()
    ledy.high()
    sleep(3)
    ledg.low()