input: Write a function to print a list of strings in alphabetical order. The function should take a list of strings as input and print each string in the sorted order.
  assert print_alphabetical(['cat', 'dog', 'apple', 'banana'])==None
  assert print_alphabetical(['zebra', 'elephant', 'aardvark', 'giraffe'])==None
  assert print_alphabetical(['one', 'two', 'three', 'four'])==None
  assert print_alphabetical(['alpha', 'beta', 'gamma', 'delta'])==None
  assert print_alphabetical([])==None
output: def print_alphabetical(strings):
      for s in sorted(strings):
          print(s)