input: Write a python function to filter words with more than 3 characters in a sentence.
  assert filter_long_words('This is an example sentence') == ['This', 'example', 'sentence']
  assert filter_long_words('Hello world this is a test') == ['Hello', 'world', 'this', 'test']
  assert filter_long_words('A quick brown fox jumps over the lazy dog') == ['quick', 'brown', 'jumps', 'over', 'lazy']
output: def filter_long_words(sentence):
      return [word for word in sentence.split() if len(word) > 3]