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 woman smiles with her tennis racket between two older people'. Reverse all words of length '3' in the given sentence.

eht woman smiles with reh tennis racket between owt older people