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 bird sitting in a tree next to a citrus fruit'. Reverse all words of length '6' in the given sentence.
answer:
a bird sitting in a tree next to a surtic fruit


question:
Sentence: 'a person in a rowboat under an umbrella'. Reverse all words of length '5' in the given sentence.
answer:
a person in a rowboat rednu an umbrella


question:
Sentence: 'a group of small airplanes flying up in the sky'. Reverse all words of length '6' in the given sentence.
answer:

a group of small airplanes gniylf up in the sky