Build a small phone-book helper. 1. The starter already creates `contacts = {"Anna": "111", "Boris": "222", "Clara": "333"}`. 2. Write `lookup(name)` that returns `contacts.get(name, "unknown")` — so missing names don't crash. 3. Print `lookup("Anna")` and `lookup("Dan")` (Dan is not in the dict). 4. Use a list comprehension to print a list of names whose length is even (use `len(name) % 2 == 0`). For this dict that's `['Anna', 'Clara']`. Expected output (three lines): ``` 111 unknown ['Anna', 'Clara'] ```