Find employees without badges

Facilities needs to chase employees who never picked up a badge. employees rows look like "id,name" (ids and names are distinct); badge_ids is a list of employee ids that already have a badge (it may contain ids not in the employee list). Return the names of employees whose id is NOT in badge_ids, sorted alphabetically. Example: employees ["e1,ava", "e2,raj", "e3,mia"] with badge_ids ["e2"] gives ["ava", "mia"].