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: 'there is a group of people standing on the beach'. Reverse all words of length '8' in the given sentence.

A: there is a group of people gnidnats on the beach
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Q: Sentence: 'a couple of elephants that are in some water'. Reverse all words of length '6' in the given sentence.

A: a elpuoc of elephants that are in some water
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Q: Sentence: 'the men a rowing a boat across the water'. Reverse all words of length '1' in the given sentence.

A:
the men a rowing a boat across the water
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