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 bathroom area with writing on the wall and a mirror'. Reverse all words of length '4' in the given sentence.
a bathroom aera htiw writing on the llaw and a mirror

Sentence: 'a young boy plays with a phone sitting on the ground'. Reverse all words of length '6' in the given sentence.
a young boy plays with a phone sitting on the dnuorg

Sentence: 'a man on a snowboard in the air'. Reverse all words of length '9' in the given sentence.

a man on a draobwons in the air