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 large flock of birds fly through the sky'. Reverse all words of length '3' in the given sentence.
[EX A]: a large flock of birds ylf through eht yks

[EX Q]: Sentence: 'a bear in a field next to a pond'. Reverse all words of length '5' in the given sentence.
[EX A]: a bear in a dleif next to a pond

[EX Q]: Sentence: 'a couple of elephants eating hay with their trunks on a field'. Reverse all words of length '1' in the given sentence.
[EX A]:
a couple of elephants eating hay with their trunks on a field