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.

[EX Q]: Sentence: 'a group of zebras gather at a watering hole'. Reverse all words of length '1' in the given sentence.
[EX A]: a group of zebras gather at a watering hole

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

[EX Q]: Sentence: 'the man in the picture is reaching toward a frisbee'. Reverse all words of length '3' in the given sentence.
[EX A]:
eht nam in eht picture is reaching toward a frisbee