You're given a string. Your task: remove all vowels (A, E, I, O, U, Y and their lowercase versions), then insert a dot before each remaining consonant. Output the transformed string in lowercase.
This problem tests your ability to filter characters and rebuild a string. You'll need to check if each character is a vowel, skip it if so, otherwise add a dot followed by the lowercase consonant.
The challenge involves character classification and string building. Think about how you'd check if a character belongs to a specific set, then construct the output incrementally.