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 trains are sitting on some tracks'. Reverse all words of length '2' in the given sentence.
a couple fo trains are sitting no some tracks

Sentence: 'a woman holds a frisbee close by a second woman that is eying the frisbee with an arm held out while two other players stand waiting in the background'. Reverse all words of length '4' in the given sentence.
a woman holds a frisbee close by a second woman taht is eying the frisbee htiw an arm dleh out while two other players stand waiting in the background

Sentence: 'a large blue passenger train pulling into a train station'. Reverse all words of length '9' in the given sentence.

a large blue regnessap train pulling into a train station