def f(x):
    def g(y):
        def h(z):
            print('jade')
        h(1)
        return x + y
    g(2 * x)
f(4)

def flip(digits):
    def slice(num):
        num, last = num // 10, num % 10
        return num, last
    flipped = 0
    while digits > 10:
        digits, last = slice(digits)
        flipped = flipped * 10 + last
    return flipped
flip(123456)