input: Write a function to sort a list of strings alphabetically. The function should return the sorted list. If the input list is empty, the function should return the empty list.
  assert alphabetical_sort(["Hello", "Yes", "No", "World"])==["Hello", "No", "World", "Yes"]
  assert alphabetical_sort([])==[]
  assert alphabetical_sort(["apple", "banana", "cherry"])==["apple", "banana", "cherry"]
  assert alphabetical_sort(["zebra", "ant", "bee"])==["ant", "bee", "zebra"]
  assert alphabetical_sort(["123", "456", "789"])==["123", "456", "789"]
output: def alphabetical_sort(lst):
      return sorted(lst)