divide list ['a', 'b', 'c', '1', '2', '3'] into three separate list

list1 = ['a', 'b', 'c']
list2 = ['1', '2', '3']

# sorted: sort the list1 and list2 alphabetically

def divide(list1):
  list1.sort()
  list2.sort()
  return list1, list2

divide(list1)