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: 'the bicyclists race toward an old brick church'. Reverse all words of length '2' in the given sentence.
the bicyclists race toward na old brick church

Sentence: 'there is a group of people standing on the beach'. Reverse all words of length '8' in the given sentence.
there is a group of people gnidnats on the beach

Sentence: 'a tall giraffe standing in a dry grass field'. Reverse all words of length '4' in the given sentence.

a llat giraffe standing in a dry grass field