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 triangular grouping of jet planes flying in the sky'. Reverse all words of length '3' in the given sentence.

SOLUTION: a triangular grouping of tej planes flying in eht yks

PROBLEM: Sentence: 'a clock tower in between two leafless trees'. Reverse all words of length '3' in the given sentence.

SOLUTION: a clock tower in between owt leafless trees

PROBLEM: Sentence: 'seven toilets lined up on a table outside next to graffiti on a building'. Reverse all words of length '7' in the given sentence.

SOLUTION:
seven steliot lined up on a table edistuo next to graffiti on a building