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'.
Q: Context: New Prime Minister Nawaz Sharif acknowledged his country's nuclear capability on 7 September 1997. Link Information: Nawaz Sharif became the 12th Prime Minister of Pakistan on 1 November 1990 Question: How long had Nawaz Sharif been in power as the Prime Minister when he acknowledged his country's nuclear capabilities?
A:
Answer: 6