#Your optional code here
#You can import some modules or create additional functions

    def checkio(number):
        if number % 3 == 0 and number % 5 == 0:
            number = 'Fizz Buzz'
        elif number % 3 == 0:
            number = 'Fizz'
        elif number % 5 == 0:
            number = 'Buzz'
        else: 
            number = str(number)

        return str(number)