Challenge - #38 - Introduction to Sets

 def average(array):

    # your code goes here

    lst = list(set(array))

    avg_height = sum(lst)/len(lst)

    return avg_height

if __name__ == '__main__':

    n = int(input())

    arr = list(map(int, input().split()))

    result = average(arr)

    print(result)