
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").
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"