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 riding in a black raft'. Reverse all words of length '1' in the given sentence.
a group of people riding in a black raft

Sentence: 'a skateboarder in mid air during a trick'. Reverse all words of length '6' in the given sentence.
a skateboarder in mid air gnirud a trick

Sentence: 'a large white airplane flying high up in the sky'. Reverse all words of length '4' in the given sentence.

a large white airplane flying hgih up in the sky