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: 'a grey clock tower with trees and wall below'. Reverse all words of length '5' in the given sentence.
Example Output: a grey kcolc rewot with seert and wall woleb

Example Input: Sentence: 'a man and a woman wearing all black are sitting next to each other on a bench'. Reverse all words of length '4' in the given sentence.
Example Output: a man and a woman wearing all black are sitting txen to hcae other on a bench

Example Input: Sentence: 'a woman skating on a slope near some buildings'. Reverse all words of length '7' in the given sentence.
Example Output:
a woman gnitaks on a slope near some buildings