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 couple of elephants that are in some water'. Reverse all words of length '6' in the given sentence.

SOLUTION: a elpuoc of elephants that are in some water

PROBLEM: Sentence: 'a cat stinking its tongue out beside food'. Reverse all words of length '1' in the given sentence.

SOLUTION: a cat stinking its tongue out beside food

PROBLEM: Sentence: 'a man holding a sandwich in each hand'. Reverse all words of length '7' in the given sentence.

SOLUTION:
a man gnidloh a sandwich in each hand