Reverse Words in a String

Given an input string $s$, reverse the order of the words. A word is defined as a sequence of non-space characters. The words in s will be separated by at least one space. Return a string of the words in reverse order concatenated by a single space. Example 1: Input: ``` 1 the sky is blue ``` Output: ``` blue is sky the ``` Example 2: Input: ``` 1 hello world ``` Output: ``` world hello ``