TASK DEFINITION: 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.
PROBLEM: Sentence: 'a herd of horses is exercised in the yard led by a man on horseback'. Reverse all words of length '6' in the given sentence.

SOLUTION: a herd of sesroh is exercised in the yard led by a man on horseback

PROBLEM: Sentence: 'a passenger train moves along tracks near a field and trees'. Reverse all words of length '1' in the given sentence.

SOLUTION: a passenger train moves along tracks near a field and trees

PROBLEM: Sentence: 'some people with luggage near a van that is transporting it'. Reverse all words of length '12' in the given sentence.

SOLUTION:
some people with luggage near a van that is gnitropsnart it