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: 'there is a group of people standing on the beach'. Reverse all words of length '8' in the given sentence.
there is a group of people gnidnats on the beach

Sentence: 'a skateboarder riding down a rail during the day'. Reverse all words of length '3' in the given sentence.
a skateboarder riding down a rail during eht yad

Sentence: 'a large cargo plane on display at an airshow'. Reverse all words of length '5' in the given sentence.

a egral ograc enalp on display at an airshow