''' Q9: Given list x as input, reverse the elements of x and return the resulting list.
>>> f([1,4,6,2,3])
[3,2,6,4,1]
>>> f([2]) 
[2]
>>> f(['a','b','c'])
['c','b','a']
>>> f([[1,2],[],[2,3]])
[[2,3],[],[1,2]]
'''
def f(x):
    # Your Code Here!
    pass

if __name__ == '__main__':
    import doctest
    doctest.testmod()