Somewhere there is a village where there live two kinds of people, knights and scoundrels, in which knights always tell the truth and scoundrels always tell lies. One day, a scholar who knew the situation passed by the village and saw two A.B people in the village. He asked An a question: are there any knights between you? A replied, No. After listening to A's words, the scholar thought about it for a moment, and then correctly deduced who An and B are respectively.
judging by the scholar?
A is a scoundrel, B is a knight