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 dog curled up sleeping on a bed with pillows'. Reverse all words of length '6' in the given sentence.
Example Output: a dog delruc up sleeping on a bed with pillows

Example Input: Sentence: 'a group of people para sailing on a beach'. Reverse all words of length '5' in the given sentence.
Example Output: a puorg of people para sailing on a hcaeb

Example Input: Sentence: 'two sailboats travel in calm waters on the ocean'. Reverse all words of length '2' in the given sentence.
Example Output:
two sailboats travel ni calm waters no the ocean