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 group of people wearing skis and standing at the top of a ski slope'. Reverse all words of length '7' in the given sentence.
a group of people gniraew skis and standing at the top of a ski slope

Sentence: 'a man with a tennis racket gets ready to hit a ball'. Reverse all words of length '5' in the given sentence.
a man with a tennis racket gets ydaer to hit a ball

Sentence: 'a tennis player swinging at a tennis ball'. Reverse all words of length '1' in the given sentence.

a tennis player swinging at a tennis ball