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 city truck two city buses and a yellow fire hydrant'. Reverse all words of length '4' in the given sentence.
a ytic truck two ytic buses and a yellow erif hydrant

Sentence: 'a blue colored sign with a white arrow'. Reverse all words of length '1' in the given sentence.
a blue colored sign with a white arrow

Sentence: 'a brown dog laying on a rock covered dirt ground'. Reverse all words of length '1' in the given sentence.

a brown dog laying on a rock covered dirt ground