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 group of sheep graze in a grassy field'. Reverse all words of length '2' in the given sentence.
answer:
a group fo sheep graze ni a grassy field

question:
Sentence: 'a salt and pepper shaker near a plate with food'. Reverse all words of length '3' in the given sentence.
answer:
a salt dna pepper shaker near a plate with food

question:
Sentence: 'a tennis player is in the middle of serving a ball'. Reverse all words of length '4' in the given sentence.
answer:
a tennis player is in the middle of serving a llab