📝 **Task:** Group words \`["apple", "ant", "bat", "bee"]\` by their first letter into a defaultdict(list). Print the result as a sorted dict. Expected: {'a': ['apple', 'ant'], 'b': ['bat', 'bee']} 📋 Edit the starter code below. Tests run automatically. 💡 **Hint:** Re-read the theory if you get stuck.