137. Reverse Words in a String

MediumString

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. Note that s may contain leading or trailing spaces or multiple spaces between two words. The returned string should only have a single space separating the words. Do not include any extra spaces.

Examples

Input: the sky is blue

Output: blue is sky the

Explanation: Words reversed in order.

Constraints

1 <= s.length <= 10^4
s contains English letters (upper-case and lower-case), digits, and spaces ' '.
There is at least one word in s.

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