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 skateboarder riding down a rail during the day'. Reverse all words of length '3' in the given sentence.
a skateboarder riding down a rail during eht yad

Sentence: 'a football game on a grassy playing field'. Reverse all words of length '2' in the given sentence.
a football game no a grassy playing field

Sentence: 'a girl looking in the mirror brushing her teeth'. Reverse all words of length '7' in the given sentence.

a girl gnikool in the mirror brushing her teeth