def main():
print(function_one(['good', 'cat', 'bad', 'cat']))
print(function_two(496))
print(function_three(2048))
print(function_four([1, ['A', 2], 'B', 3, 'C', 4, ['D', 5]]))
print(function_five(['A', ['A', 'B'], 'C']))
my_circle = Circle()
my_circle.radius = 5
print(my_circle.area())
print(my_circle.circumference())
