Detailed Instructions: 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.
Problem:Sentence: 'a man sitting with his backpack and skateboard outside'. Reverse all words of length '3' in the given sentence.
Solution:
a nam sitting with sih backpack dna skateboard outside