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 herd of horses is exercised in the yard led by a man on horseback'. Reverse all words of length '6' in the given sentence.

A: a herd of sesroh is exercised in the yard led by a man on horseback
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Q: Sentence: 'a room with a green rug and a daybed'. Reverse all words of length '1' in the given sentence.

A:
a room with a green rug and a daybed
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