Instructions: In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Input: Context: On December 29, 1911 the Mongols declared their independence from the collapsing Qing Empire following the Xinhai Revolution. Link Information: The turning point was the Wuchang uprising on 10 October 1911, which was the result of the mishandling of the Railway Protection Movement. The revolution ended with the abdication of the six-year-old Last Emperor, Puyi, on 12 February 1912 Question: For many years did the revolution last that was followed by the the Mongols declaring independence?
Output:
Answer: 4