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.
Q: Sentence: 'a person in a long overcoat sitting outdoors on a wooden bench'. Reverse all words of length '2' in the given sentence.
A: 
a person ni a long overcoat sitting outdoors no a wooden bench