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 man being towed behind a boat on a board'. Reverse all words of length '4' in the given sentence.

A: a man being towed behind a taob on a board
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Q: Sentence: 'a table with different dishes of food on it'. Reverse all words of length '4' in the given sentence.

A: a table htiw different dishes of doof on it
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Q: Sentence: 'an elephant is walking among some rocks and grass'. Reverse all words of length '8' in the given sentence.

A:
an tnahpele is walking among some rocks and grass
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