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: 'an old traditional pirate ship in modern city'. Reverse all words of length '3' in the given sentence.
Example Output: an dlo traditional pirate ship in modern city

Example Input: Sentence: 'skateboarder performing a grind on the side of the wall'. Reverse all words of length '4' in the given sentence.
Example Output: skateboarder performing a grind on the edis of the llaw

Example Input: Sentence: 'a little kid sits in front of a stuffed animal an some carrots'. Reverse all words of length '3' in the given sentence.
Example Output:
a little dik sits in front of a stuffed animal an some carrots