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 that has a toilet with a sink and counter combination above it and a shower and bathtub combination to the side'. Reverse all words of length '7' in the given sentence.
a bathroom that has a toilet with a sink and retnuoc combination above it and a shower and buthtab combination to the side