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: 'an openair tour bus driving in a city'. Reverse all words of length '7' in the given sentence.

SOLUTION: an rianepo tour bus gnivird in a city

PROBLEM: Sentence: 'several people enjoying various activities at the beach'. Reverse all words of length '10' in the given sentence.

SOLUTION: several people enjoying various seitivitca at the beach

PROBLEM: Sentence: 'a young man brushing his teeth with toothpaste all over his face'. Reverse all words of length '4' in the given sentence.

SOLUTION:
a young man brushing his teeth htiw toothpaste all revo his ecaf