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 couple of elephants that are in some water'. Reverse all words of length '6' in the given sentence.
a elpuoc of elephants that are in some water

Sentence: 'a wall decorated with fans and other art work'. Reverse all words of length '1' in the given sentence.
a wall decorated with fans and other art work

Sentence: 'child in a body town getting their teeth brushed'. Reverse all words of length '1' in the given sentence.

child in a body town getting their teeth brushed