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 tennis player is holding a tennis racket with the crowd in the background'. Reverse all words of length '3' in the given sentence.

SOLUTION: a tennis player is holding a tennis racket with eht crowd in eht background

PROBLEM: Sentence: 'a black cat sitting on top of a laptop on a table'. Reverse all words of length '5' in the given sentence.

SOLUTION: a kcalb cat sitting on top of a laptop on a elbat

PROBLEM: Sentence: 'a little league player who has just swung his bat'. Reverse all words of length '5' in the given sentence.

SOLUTION:
a little league player who has just gnuws his bat