In this task, you are given a question. You have to answer the question based on your information.

Example input: Roman Yakub won first price in a Choral Composition Competition at a liberal arts college founded by who?
Example output: William Egbert
Example explanation: This is a good example, and output correctly answers the question.
Q: Aleksandr Lyapunov and Israel Gelfand, share which mutual occupation?
A:
mathematician