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.
--------
Question: Sentence: 'yachts are all tied up in a marina dock'. Reverse all words of length '3' in the given sentence.

Answer: yachts era lla tied up in a marina dock


Question: Sentence: 'competitor preparing to return volley during major tennis tournament'. Reverse all words of length '6' in the given sentence.

Answer: competitor preparing to nruter yellov gnirud major sinnet tournament


Question: Sentence: 'a persons feet are on top of a skateboard'. Reverse all words of length '4' in the given sentence.

Answer:
a persons teef are on top of a skateboard