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: 'an elephant is in a large field standing in the grass'. Reverse all words of length '1' in the given sentence.

A: an elephant is in a large field standing in the grass
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Q: Sentence: 'a small white dog with a hat on his rear end'. Reverse all words of length '3' in the given sentence.

A: a small white god with a tah on sih rear dne
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Q: Sentence: 'two cats are sitting on a bench looking out the window'. Reverse all words of length '6' in the given sentence.

A:
two cats are sitting on a bench looking out the wodniw
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