Welcome to your interview.
The question is on your right: Validate ISIN Format. 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.
In Python, write a function to check if a given string is in the ISIN (International Securities Identification Number) format, which consists of exactly 12 characters: the first two are uppercase letters (country code), followed by nine alphanumeric characters, and ending with a single numeric check digit. Return True if the string is valid and False otherwise.