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: 'two giraffes with beautiful markings are shown from behind'. Reverse all words of length '8' in the given sentence.

SOLUTION: two seffarig with beautiful sgnikram are shown from behind

PROBLEM: Sentence: 'a bear in a field next to a pond'. Reverse all words of length '5' in the given sentence.

SOLUTION: a bear in a dleif next to a pond

PROBLEM: Sentence: 'a large black bear walking across a lush green field'. Reverse all words of length '7' in the given sentence.

SOLUTION:
a large black bear gniklaw across a lush green field