from machine import Pin
import utime 
Red=Pin(28,Pin.OUT)
Yellow=Pin(27,Pin.OUT)
Green=Pin(26,Pin.OUT)
Orange=Pin(22,Pin.OUT)
Red.low()
Yellow.low()
Green.low()
Orange.low()
while True: 
    Red.toggle()
    print("A")
    utime.sleep(1)
    Yellow.toggle()
    print("v")
    utime.sleep(1)
    Green.toggle()
    print("A")
    utime.sleep(1)
    Orange.toggle()
    print("n")
    utime.sleep(1)