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.

Example Input: Sentence: 'a female tennis player is running to catch the ball'. Reverse all words of length '6' in the given sentence.
Example Output: a elamef sinnet reyalp is running to catch the ball

Example Input: Sentence: 'an old church with two bell towers is pictured'. Reverse all words of length '8' in the given sentence.
Example Output: an old church with two bell towers is derutcip

Example Input: Sentence: 'a group of people sitting around a table eating'. Reverse all words of length '5' in the given sentence.
Example Output:
a puorg of people sitting around a elbat eating