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 large long train on a steel track'. Reverse all words of length '2' in the given sentence.

SOLUTION: a large long train no a steel track

PROBLEM: Sentence: 'skateboarder performing a grind on the side of the wall'. Reverse all words of length '4' in the given sentence.

SOLUTION: skateboarder performing a grind on the edis of the llaw

PROBLEM: Sentence: 'a group of people standing on top of a boat in a river'. Reverse all words of length '5' in the given sentence.

SOLUTION:
a puorg of people standing on top of a boat in a revir