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: 'looking down at skiers holding their skis on the ski slope'. Reverse all words of length '7' in the given sentence.
gnikool down at skiers gnidloh their skis on the ski slope

Sentence: 'pair of dogs watching television in living area of home'. Reverse all words of length '8' in the given sentence.
pair of dogs gnihctaw television in living area of home

Sentence: 'a couple of young men playing games on the nintendo wii'. Reverse all words of length '3' in the given sentence.

a couple of young nem playing games on eht nintendo iiw