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 fire hydrant placed in the street just off the curb'. Reverse all words of length '3' in the given sentence.

A: a fire hydrant placed in eht street just ffo eht curb
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Q: Sentence: 'four cute little ducklings swimming in the water'. Reverse all words of length '6' in the given sentence.

A: four cute elttil ducklings swimming in the water
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Q: Sentence: 'an empty side walk with in a city'. Reverse all words of length '5' in the given sentence.

A:
an ytpme side walk with in a city
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