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 water bottle sitting on top of a counter'. Reverse all words of length '6' in the given sentence.

A: a water elttob sitting on top of a counter
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Q: Sentence: 'three cows graze on the food that sits just outside their pens'. Reverse all words of length '5' in the given sentence.

A: eerht cows ezarg on the food that sits just outside rieht pens
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Q: Sentence: 'a young man is on the court playing tennis'. Reverse all words of length '7' in the given sentence.

A:
a young man is on the court gniyalp tennis
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