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: 'the three trains are stopped on the railroad tracks'. Reverse all words of length '6' in the given sentence.
Example Output: the three sniart are stopped on the railroad skcart

Example Input: Sentence: 'a bunch off stuffed animals are on a car'. Reverse all words of length '7' in the given sentence.
Example Output: a bunch off deffuts slamina are on a car

Example Input: Sentence: 'a big room with a bed inside of it'. Reverse all words of length '2' in the given sentence.
Example Output:
a big room with a bed inside fo ti