from machine import Pin
from utime import sleep

print("Hello,Pi Pico")
led1 = Pin(27,Pin.OUT)
led2 = Pin(26,Pin.OUT)
led3 = Pin(22,Pin.OUT)
led4 = Pin(21,Pin.OUT)

while True:
 led1.value(1)
 led2.value(0)
 led3.value(0)
 led4.value(0)
 sleep(1)
 led1.value(0)
 led2.value(1)
 led3.value(0)
 led4.value(0)
 sleep(1)
 led1.value(0)
 led2.value(0)
 led3.value(1)
 led4.value(0)
 sleep(1)
 led1.value(0)
 led2.value(0)
 led3.value(0)
 led4.value(1)
 sleep(1)