input: Write a function to sort a list of words in alphabetical order.
  assert sort_list(['Elephant', 'Cat', 'Dog']) == ['Cat', 'Dog', 'Elephant']
  assert sort_list(['banana', 'apple', 'cherry']) == ['apple', 'banana', 'cherry']
  assert sort_list(['Zebra', 'lion', 'Tiger']) == ['Tiger', 'Zebra', 'lion']
output: def sort_list(words):
      return sorted(words, key=str.lower)