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 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: 'pictures a candle a single flower and a stuffed bear on a table'. Reverse all words of length '6' in the given sentence.

A: pictures a eldnac a elgnis rewolf and a stuffed bear on a table
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Q: Sentence: 'a group of people with surfboards walk on the beach'. Reverse all words of length '5' in the given sentence.

A:
a puorg of people with surfboards walk on the hcaeb
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