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 person on a surfboard riding a wave in the water'. Reverse all words of length '5' in the given sentence.
Example Output: a person on a surfboard riding a wave in the retaw

Example Input: Sentence: 'pineapple and hot dog skewers are shown as appetizers'. Reverse all words of length '9' in the given sentence.
Example Output: elppaenip and hot dog skewers are shown as appetizers

Example Input: Sentence: 'a guy in a blue shirt holds up a green and blue umbrella'. Reverse all words of length '3' in the given sentence.
Example Output:
a yug in a blue shirt holds up a green dna blue umbrella