from machine import Pin
from time import sleep
A=Pin(1,Pin.OUT)
B=Pin(2,Pin.OUT)
C=Pin(3,Pin.OUT)
D=Pin(4,Pin.OUT)
E=Pin(5,Pin.OUT)
F=Pin(6,Pin.OUT)
G=Pin(7,Pin.OUT)
while True:
    A.value(0)
    A.value(0)
    A.value(0)