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: 'there are many animals standing on the top of this mountain'. Reverse all words of length '4' in the given sentence.
Example Output: there are ynam animals standing on the top of siht mountain

Example Input: Sentence: 'a wooden pole with multiple street signs mounted on it'. Reverse all words of length '2' in the given sentence.
Example Output: a wooden pole with multiple street signs mounted no ti

Example Input: Sentence: 'a cake that is on top of a table'. Reverse all words of length '4' in the given sentence.
Example Output:
a ekac taht is on top of a table