problem:

Given an input string, reverse the string word by word.

For example,
Given s = "the sky is blue",
return "blue is sky the".

solution: 
class Solution:
    # @param s, a string
    # @return a string
    def reverseWords(self, s):
        
        newstring = s.split()[::-1]
        
        cs= ' '.join([i for i in newstring])
        
        
        return str(cs)