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.

Sentence: 'a female tennis player is running to catch the ball'. Reverse all words of length '6' in the given sentence.
a elamef sinnet reyalp is running to catch the ball

Sentence: 'a knife sits next to a carrot on a cutting board'. Reverse all words of length '7' in the given sentence.
a knife sits next to a carrot on a gnittuc board

Sentence: 'many people are gathering around a person'. Reverse all words of length '3' in the given sentence.

many people era gathering around a person