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.

Input: Consider Input: What mountain range contains Lake Constance?

Output: proper

Input: Consider Input: What was the end of the War of the Australian Succession?

Output: proper

Input: Consider Input: When did Vienna, make that Prussia, become the center of the Congress Poland?
Output: disfluent