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: '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 couple of trains are sitting on some tracks'. Reverse all words of length '2' in the given sentence.
Example Output: a couple fo trains are sitting no some tracks

Example Input: Sentence: 'a shirtless man on white surfboard next to a wave'. Reverse all words of length '9' in the given sentence.
Example Output:
a sseltrihs man on white draobfrus next to a wave