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 large elephant standing in the wild'. Reverse all words of length '5' in the given sentence.

SOLUTION: a egral elephant standing in the wild

PROBLEM: Sentence: 'the bicyclists race toward an old brick church'. Reverse all words of length '2' in the given sentence.

SOLUTION: the bicyclists race toward na old brick church

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

SOLUTION:
a large black bear gniklaw with its cub across a field