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.

Q: Sentence: 'a couple of trains are sitting on some tracks'. Reverse all words of length '2' in the given sentence.

A: a couple fo trains are sitting no some tracks
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Q: Sentence: 'a man assisting a person on a horse on a race track'. Reverse all words of length '3' in the given sentence.

A: a nam assisting a person on a horse on a race track
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Q: Sentence: 'an open market has a large variety of vegetables'. Reverse all words of length '3' in the given sentence.

A:
an open market sah a large variety of vegetables
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