solution.py

def is_power_of_2(num):
    if num < 2:
        return False
    power = int(math.log(num, 2) + 0.5)
    return 2 ** power == num


def func(x, y):
    maxx = max(len(x), len(y))
    if len(x) == len(y) and is_power_of_2(len(x)):
        return x, y
    while not is_power_of_2(maxx):
        maxx += 1
    return ([0] * (maxx - len(x))) + x, ([0] * (maxx - len(y))) + y