Welcome to your interview.
The question is on your right: State Machine Implementation. 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.
Write a program that models a state machine, such as a vending machine, managing state transitions, inputs, and error conditions.