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 group of people loading a tour bus'. Reverse all words of length '3' in the given sentence.

SOLUTION: a group of people loading a tour sub

PROBLEM: Sentence: 'black and silver fire hydrant sitting next to a road'. Reverse all words of length '7' in the given sentence.

SOLUTION: black and silver fire tnardyh gnittis next to a road

PROBLEM: Sentence: 'group of people sitting down at a table and eating together'. Reverse all words of length '7' in the given sentence.

SOLUTION:
group of people gnittis down at a table and eating together