input: Write a function to generate a Python program that takes a list of strings as input and prints the strings in alphabetical order. The function should return the sorted list of strings.
  assert (alphabetical_order(['cat', 'dog', 'apple', 'banana'])) == ['apple', 'banana', 'cat', 'dog']
  assert (alphabetical_order(['zebra', 'lion', 'elephant', 'tiger']))==['elephant', 'lion', 'tiger', 'zebra']
  assert (alphabetical_order(['car', 'bus', 'train', 'bike']))==['bike', 'bus', 'car', 'train']
  assert (alphabetical_order(['red', 'blue', 'green', 'yellow']))==['blue', 'green', 'red', 'yellow']
  assert (alphabetical_order([]))==[]
output: def alphabetical_order(strings):
      return sorted(strings)