instruction:
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.
question:
Sentence: 'a small white dog with a hat on his rear end'. Reverse all words of length '3' in the given sentence.
answer:
a small white god with a tah on sih rear dne


question:
Sentence: 'a grey cat with green eyes looking straight ahead'. Reverse all words of length '1' in the given sentence.
answer:
a grey cat with green eyes looking straight ahead


question:
Sentence: 'police cars sit on the side of the road behind a truck'. Reverse all words of length '2' in the given sentence.
answer:

police cars sit no the side fo the road behind a truck