Classify the input text into either disfluent questions or proper questions. A disfluent question is a question that has some interruptions in it while framing. A proper question is the correct form of the question without any disfluency.

Ex Input:
What is named for its resemblance to dendritic cells?

Ex Output:
proper


Ex Input:
In what century did all of the dead branches dry up?

Ex Output:
proper


Ex Input:
When did economists reach a conclusion without the S&P's rating agency?

Ex Output:

proper