USING PYTHON

Write a function decipher(s) that takes as input an arbitrary string s that has already been enciphered by having its characters rotated by some amount (possibly 0). decipher should return, to the best of its ability, the original English string, which will be some rotation (possibly 0) of the input string s. For example:

>>> decipher('Bzdrzq bhogdq? H oqdedq Bzdrzq rzkzc.') 'Caesar cipher? I prefer Caesar salad.'