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 sign explain the meaning of the road work'. Reverse all words of length '7' in the given sentence.
answer:
a sign nialpxe the gninaem of the road work


question:
Sentence: 'a man watches two giraffes eating from a box'. Reverse all words of length '4' in the given sentence.
answer:
a man watches two giraffes eating morf a box


question:
Sentence: 'a man looking ahead and a wall in the back'. Reverse all words of length '7' in the given sentence.
answer:

a man gnikool ahead and a wall in the back