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.

Ex Input:
Sentence: 'a person at a zoo looking over the fence of a giraffe enclosure'. Reverse all words of length '6' in the given sentence.

Ex Output:
a nosrep at a zoo looking over the fence of a giraffe enclosure


Ex Input:
Sentence: 'a bus with lots of big tires sitting parked on a street'. Reverse all words of length '6' in the given sentence.

Ex Output:
a bus with lots of big tires sitting dekrap on a teerts


Ex Input:
Sentence: 'a train engine pulling carts into a station as passengers wait'. Reverse all words of length '4' in the given sentence.

Ex Output:

a train engine pulling carts otni a station as passengers tiaw