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 cat with green eyes looking straight ahead'. Reverse all words of length '1' in the given sentence.
Example Output: a grey cat with green eyes looking straight ahead

Example Input: Sentence: 'a person that has their skis crossed in the air as they snow ski'. Reverse all words of length '4' in the given sentence.
Example Output: a person taht has their siks crossed in the air as yeht wons ski

Example Input: Sentence: 'a brown horse pulling a couple of people behind it'. Reverse all words of length '5' in the given sentence.
Example Output:
a nworb esroh pulling a couple of people behind it