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.

Sentence: 'a large grouo of people riding on a bunch of motorcycles'. Reverse all words of length '5' in the given sentence.
a egral ouorg of people riding on a hcnub of motorcycles

Sentence: 'two young boys standing on grass near a fence'. Reverse all words of length '8' in the given sentence.
two young boys gnidnats on grass near a fence

Sentence: 'a couple and their two sons pose for the camera'. Reverse all words of length '4' in the given sentence.

a couple and their two snos esop for the camera