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: 'teenagers riding skateboards in a concrete skate park'. Reverse all words of length '1' in the given sentence.
teenagers riding skateboards in a concrete skate park

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 person stands on a snowy hill while holding some poles'. Reverse all words of length '4' in the given sentence.

a person stands on a snowy llih while holding emos poles