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.

What policy did Marxists no um Stalin implement shortly after Lenin's birth?
disfluent

When did Vienna, make that Prussia, become the center of the Congress Poland?
disfluent

Which parliament has no ability to amend the terms of reference of the Scottish Parliament?

proper