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: 'an old fashioned setting of people playing tennis'. Reverse all words of length '6' in the given sentence.
answer:
an old fashioned setting of elpoep playing sinnet


question:
Sentence: 'a couple of toothbrushes that are on a towel'. Reverse all words of length '6' in the given sentence.
answer:
a elpuoc of toothbrushes that are on a towel


question:
Sentence: 'people in line at a buffet serving of food'. Reverse all words of length '4' in the given sentence.
answer:

people in enil at a buffet serving of doof