问题描述：

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

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

代码：

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