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: 'small blue and red bird standing on rear of zebra'. Reverse all words of length '8' in the given sentence.
Example Output: small blue and red bird gnidnats on rear of zebra

Example Input: Sentence: 'one white and black sheep and one brown and black sheep'. Reverse all words of length '5' in the given sentence.
Example Output: one etihw and kcalb peehs and one nworb and kcalb peehs

Example Input: Sentence: 'a large brick building with a clock on front of it'. Reverse all words of length '8' in the given sentence.
Example Output:
a large brick gnidliub with a clock on front of it