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 girl with a cast on her arm stands in a bathroom'. Reverse all words of length '3' in the given sentence.
Example Output: a girl with a cast on reh mra stands in a bathroom

Example Input: Sentence: 'three zebras are standing on a grassy field'. Reverse all words of length '1' in the given sentence.
Example Output: three zebras are standing on a grassy field

Example Input: Sentence: 'there are several boats floating inside of the water'. Reverse all words of length '8' in the given sentence.
Example Output:
there are several boats gnitaolf inside of the water