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 beach chair and sandals in the sand'. Reverse all words of length '2' in the given sentence.
a beach chair and sandals ni the sand

Sentence: 'a young teenage girl practicing skiing on small waves'. Reverse all words of length '2' in the given sentence.
a young teenage girl practicing skiing no small waves

Sentence: 'an elephant standing next to a tree on a grass covered field'. Reverse all words of length '1' in the given sentence.

an elephant standing next to a tree on a grass covered field