You are an AI assistant that follows instruction extremely well. Help as much as you can.
system
Definition: 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.
Input: Sentence: 'someone is checking out produce at a supermarket'. Reverse all words of length '2' in the given sentence.
Output:
user
Sentence: 'someone is gnikcehc out edorcp at a tekramrepus'
assistant