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 black cow stands alone in a grassy field'. Reverse all words of length '3' in the given sentence.
a black woc stands alone in a grassy field

Sentence: 'an elephant is standing in the road by the truck'. Reverse all words of length '5' in the given sentence.
an elephant is standing in the road by the kcurt

Sentence: 'a single round bread object frying in oil'. Reverse all words of length '1' in the given sentence.

a single round bread object frying in oil