Definition: 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: Provisionally called Memory, screenwriter Ronald Shusett collaborated with O'Bannon on the project Link Information: Ronald Shusett (born June 1935) is an American motion picture screenwriter and producer, usually in the science fiction genre.

He wrote the original story for Alien (1979) with Dan O'Bannon and later Alien vs. Predator (2004).

In 1974, he was the first to option the Philip K. Dick short story, "We Can Remember It for You Wholesale", that became the basis of the film Total Recall. Question: How many other movies did Ronald Shusett write?
Output:
Answer: 2