In this task, you need to reverse all words of a given length in the sentence. The number of letters in a word determine its length. For example, the length of the word "apple" is 5.

Input: Consider Input: Sentence: 'a bunch of umbrellas are up in the air'. Reverse all words of length '9' in the given sentence.

Output: a bunch of sallerbmu are up in the air


Input: Consider Input: Sentence: 'a man walking a brown horse down a race track'. Reverse all words of length '4' in the given sentence.

Output: a man walking a brown horse nwod a ecar track


Input: Consider Input: Sentence: 'a park bench on walkway with grass and trees'. Reverse all words of length '4' in the given sentence.


Output: a krap bench on walkway htiw grass and trees