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 men sit at the table with books in front of them'. Reverse all words of length '5' in the given sentence.

the men sit at the elbat with skoob in tnorf of them