import machine
from machine import Pin

S3=Pin(3, Pin.OUT)
S2=Pin(2, Pin.OUT)
S1=Pin(1, Pin.OUT)
S0=Pin(0, Pin.OUT)
E1=Pin(4, Pin.IN, Pin.PULL_UP)
E0=Pin(5, Pin.IN, Pin.PULL_UP)

while True:
    A=E1.value()
    B=E0.value()
    
    salida1=(not A and B)
    salida2=(A and not B)
    salida3=(A and B)

    S1.value(salida3)
    S2.value(salida2)
    S3.value(salida1)