input: Write a python function to filter words longer than 8 characters from a list.
  assert filter_long_words(['hello', 'world', 'this', 'is', 'a', 'test', 'foobar'])==[]
  assert filter_long_words(['hello', 'world', 'this', 'is', 'a', 'test', 'foobarbaz'])==['foobarbaz']
  assert filter_long_words(['thisisaverylongword', 'tiny', 'mediumword'])==['thisisaverylongword']
output: def filter_long_words(words):
      return [word for word in words if len(word) > 8]