input: Write a python function to filter words longer than 6 characters.
  assert filter_long_words(['apple', 'banana', 'cherry', 'date', 'elderberry', 'fig', 'grape'])==['banana', 'elderberry']
  assert filter_long_words(['short', 'longerword', 'tiny', 'miniscule', 'huge'])==['longerword', 'miniscule']
  assert filter_long_words(['sevenchr', 'eighthch', 'ninechars', 'tenchars', 'sixchar'])==['eighthch', 'ninechars', 'tenchars']
output: def filter_long_words(words):
      return [word for word in words if len(word) > 6]