Just Fizz!

Just Fizz!

You should write a function that will receive a positive integer and return: "Fizz" if the number is divisible by 3 (3, 6, 9 ...) otherwise convert the given number to a string (2 -> "2").

example

Input: An integer (int).

Output: A string (str).

Examples:

assert checkio(15) == "Fizz"
assert checkio(6) == "Fizz"
assert checkio(10) == "10"
assert checkio(7) == "7"