Welcome to your interview.
The question is on your right: Duck Typing and OOP. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
What is duck typing, what languages have you used, and which dynamically typed language can you name?