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 black and white clock reads serving central oregon'. Reverse all words of length '3' in the given sentence.
Example Output: a black dna white clock reads serving central oregon

Example Input: Sentence: 'three people in a dog carrying items walking along the beach'. Reverse all words of length '7' in the given sentence.
Example Output: three people in a dog carrying items gniklaw along the beach

Example Input: Sentence: 'a giraffes reaching for a tree branch above him'. Reverse all words of length '8' in the given sentence.
Example Output:
a seffarig gnihcaer for a tree branch above him