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: 'several stacks of trunks in front of a building'. Reverse all words of length '8' in the given sentence.

SOLUTION: several stacks of trunks in front of a gnidliub

PROBLEM: Sentence: 'a couple walking in the rain using and umbrella'. Reverse all words of length '6' in the given sentence.

SOLUTION: a elpuoc walking in the rain using and umbrella

PROBLEM: Sentence: 'a bot standing near a traffic sign looking up at it'. Reverse all words of length '4' in the given sentence.

SOLUTION:
a bot standing raen a traffic ngis looking up at it