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.

Example Input: How is the prime number p in Chebyshev's no, in Bertrand's postulate expressed mathematically?
Example Output: disfluent

Example Input: Imperialism is responsible for the slow spread of what?
Example Output: proper

Example Input: What term don't Islamists think should be applied to them?
Example Output:
proper