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 green apple and knife on dark wooden stairs'. Reverse all words of length '3' in the given sentence.

SOLUTION: a green apple dna knife on dark wooden stairs

PROBLEM: Sentence: 'a bird looks around as it sits on a wire'. Reverse all words of length '4' in the given sentence.

SOLUTION: a drib looks around as it stis on a eriw

PROBLEM: Sentence: 'a large cat sits on the sofa arm next to a girl using a computer'. Reverse all words of length '4' in the given sentence.

SOLUTION:
a large cat stis on the afos arm txen to a lrig using a computer