input: Write a python function to find the longest word in a list.
  assert longest_consecutive(['a', 'bb', 'ccc', 'dd', 'eee']) == 'ccc'
  assert longest_consecutive(['hello', 'world', 'python', 'programming']) == 'programming'
  assert longest_consecutive(['one', 'two', 'three']) == 'three'
output: def longest_consecutive(words):
      if not words:
          return ""
      return max(words, key=len)