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: 'the young man is setting in the floor with his computer ear an outlet'. Reverse all words of length '3' in the given sentence.

eht young nam is setting in eht floor with sih computer rae an outlet