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 large long train on a steel track'. Reverse all words of length '2' in the given sentence.
Example Output: a large long train no a steel track

Example Input: Sentence: 'a person in bear feet standing on a skateboard'. Reverse all words of length '4' in the given sentence.
Example Output: a person in raeb teef standing on a skateboard

Example Input: Sentence: 'a man standing next to the ocean holding a colorful umbrella'. Reverse all words of length '3' in the given sentence.
Example Output:
a nam standing next to eht ocean holding a colorful umbrella