Write a function that takes in a number, num, and a single digit, digit and removes all instances of digit from num.
def remove_digit(num, digit):
>>> remove_digit(1232142, 2)
1314
    reversed, count, final = ______
    def helper(n):
        ______
        if n != digit:
            ______
            ______
    while ______:
        last, num = ______
        helper(______)
    helper(______)
    while count > 0:
        final = ______
        ______
        ______
    return final