Quiz: Top Three
Write a function, top_three, that takes a list as its argument, and returns a list of the three largest elements. For example, top_three([2,3,5,6,8,4,2,1]) == [8, 6, 5]

def top_three(input_list):
    input_list = sorted(input_list, reverse=True)
    return input_list[:3]

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