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: 'an orange longhorn bull stands among the herd'. Reverse all words of length '2' in the given sentence.
na orange longhorn bull stands among the herd

Sentence: 'the dog looks up at the cat sitting on a stone'. Reverse all words of length '1' in the given sentence.
the dog looks up at the cat sitting on a stone

Sentence: 'a group of people in street below traffic lights by buildings'. Reverse all words of length '9' in the given sentence.

a group of people in street below traffic lights by sgnidliub