import time 
from machine import Pin
led=Pin(23,Pin.OUT)
led p =Pin(21,Pin.OUT)
while True:
    led.on(1)
    time.sleep(1)
    led.off(0)
    time.sleep(1)
    led p .off(0)
    time.sleep(1)
    led p .on(1)
    time.sleep(1)