input: Write a function to count words in a sentence longer than a given length.
  assert count_long_words("The quick brown fox jumps over the lazy dog", 3) == 5
  assert count_long_words("A journey of a thousand miles begins with a single step", 6) == 3
  assert count_long_words("To be or not to be that is the question", 2) == 8
output: def count_long_words(sentence, length):
      words = sentence.split()
      return sum(1 for word in words if len(word) > length)