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: 'the couple are smiling at each other as they sit on a bench'. Reverse all words of length '4' in the given sentence.
[EX A]: the couple are smiling at hcae other as yeht sit on a bench

[EX Q]: Sentence: 'a couple of trains are sitting on some tracks'. Reverse all words of length '2' in the given sentence.
[EX A]: a couple fo trains are sitting no some tracks

[EX Q]: Sentence: 'a pair of clogs are sitting under a bench'. Reverse all words of length '1' in the given sentence.
[EX A]:
a pair of clogs are sitting under a bench