# Print and None

def triple(x):
    return 3 * x # versus print(3 * x)

def noisy(x):
    """
    >>> noisy(noisy(2) + noisy(3))
    NOISY 2
    NOISY 3
    NOISY 7
    8
    """
    print('NOISY', x)
    return x + 1

def h(x):
    """
    >>> h(2)
    3
    3
    >>> f = print
    """
    y = f(x)
    print(y)
    return y

# Prime factorization

def prime_factors(n):
    """Print the prime factors of positive integer n
       in non-decreasing order.

    >>> prime_factors(8)
    2
    2
    2
    >>> prime_factors(9)
    3
    3
    >>> prime_factors(10)
    2
    5
    >>> prime_factors(11)
    11
    >>> prime_factors(12)
    2
    2
    3
    >>> prime_factors(858)
    2
    3
    11
    13
    """
    while n > 1:
        k = smallest_factor(n)
        print(k)
        n = n // k

def smallest_factor(n):
    """Return the smallest factor of n greater than 1."""
    k = 2
    while n % k != 0:
        k = k + 1
    return k