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: 'this is a plane on the tarmac with a ladder leading up to the door and people walking around it'. Reverse all words of length '2' in the given sentence.

this si a plane no the tarmac with a ladder leading pu ot the door and people walking around ti