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 plane sitting on top of a tarmac'. Reverse all words of length '2' in the given sentence.
answer:
a small plane sitting no top fo a tarmac


question:
Sentence: 'a man riding a bike down a street past cars'. Reverse all words of length '4' in the given sentence.
answer:
a man riding a ekib nwod a street tsap srac


question:
Sentence: 'several giraffes hang out behind a chain link fence'. Reverse all words of length '8' in the given sentence.
answer:

several seffarig hang out behind a chain link fence