Implement an iterator that merges favorites and photos lists

Implement an iterator that merges favorites and photos lists (yielding favorites first), while filtering out blocked IDs and ensuring no duplicates. You will be given two input lists: one is the favorites, and the other is photos. You will also receive a set of blocked_ids that indicates the IDs to be blocked. Your task is to create an iterator that first iterates over all elements in favorites that are not in blocked_ids, then iterates over all remaining elements in photos that are not in blocked_ids, ensuring that each element returned is unique. Example: favorites = [1, 2, 3] photos = [2, 3, 4, 5] blocked_ids = {2} Output: [1, 3, 4, 5] Example Input 2 1 2 3 4 2 3 4 5 1 2