input: Write a function to sort a list of strings alphabetically.
  assert sort_alphabetically(['apple', 'pear', 'banana', 'grape']) == ['apple', 'banana', 'grape', 'pear']
  assert sort_alphabetically(['zebra', 'monkey', 'aardvark', 'leopard']) == ['aardvark', 'leopard', 'monkey', 'zebra']
  assert sort_alphabetically(['dog', 'cat', 'elephant', 'bee']) == ['bee', 'cat', 'dog', 'elephant']
output: def sort_alphabetically(strings):
      return sorted(strings)