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.

[EX Q]: Sentence: 'a tennis player is holding a tennis racket with the crowd in the background'. Reverse all words of length '3' in the given sentence.
[EX A]: a tennis player is holding a tennis racket with eht crowd in eht background

[EX Q]: Sentence: 'a guy is jumping off a skateboard in the air'. Reverse all words of length '1' in the given sentence.
[EX A]: a guy is jumping off a skateboard in the air

[EX Q]: Sentence: 'a couple of people skiing down a snow covered slope'. Reverse all words of length '6' in the given sentence.
[EX A]:
a elpuoc of elpoep gniiks down a snow covered slope