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.

Example Input: Sentence: 'the couple are smiling at each other as they sit on a bench'. Reverse all words of length '4' in the given sentence.
Example Output: the couple are smiling at hcae other as yeht sit on a bench

Example Input: Sentence: 'read clocktower on the side of a water body'. Reverse all words of length '3' in the given sentence.
Example Output: read clocktower on eht side of a water body

Example Input: Sentence: 'a female professional tennis player preparing to serve the ball'. Reverse all words of length '1' in the given sentence.
Example Output:
a female professional tennis player preparing to serve the ball