input: Write a python function to return a list of words with more than 4 characters.
  assert filter_words('A brown fox jumped over a lazy dog') == ['brown', 'jumped']
  assert filter_words('The quick brown fox jumps over the lazy dog') == ['quick', 'brown', 'jumps']
  assert filter_words('Hello world! This is a test sentence.') == ['Hello', 'world!', 'sentence.']
output: def filter_words(sentence):
      return [word for word in sentence.split() if len(word) > 4]