Take a Ten Minute Walk | Python Fiddle

"""You live in the city of Cartesia where all roads are laid out in a perfect grid.
You arrived ten minutes too early to an appointment, so you decided to take the opportunity to go
for a short walk. The city provides its citizens with a Walk Generating App on their phones
-- everytime you press the button it sends you an array of one-letter strings representing
directions to walk (eg. ['n', 's', 'w', 'e']). You know it takes you one minute to traverse
one city block, so create a function that will return true if the walk the app gives you
will take you exactly ten minutes (you don't want to be early or late!) and will, of course, 
return you to your starting point. Return false otherwise.

Note: you will always receive a valid array containing a random assortment of 
direction letters ('n', 's', 'e', or 'w' only). It will never give you an empty
array (that's not a walk, that's standing still!).
http://www.codewars.com/kata/54da539698b8a2ad76000228/train/python
"""

def isValidWalk(walk):
    #determine if walk is valid
    pass

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