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: 'three traffic lights on the same pole one is lit red while the other two are green'. Reverse all words of length '2' in the given sentence.

three traffic lights no the same pole one si lit red while the other two are green