input: Write a python function to filter words with length exactly 5 characters.
  assert filter_length(["Hello", "Hello World", "World", "Python", "Coding"]) == ["Hello", "World"]
  assert filter_length(["Apple", "Banana", "Cherry", "Dates", "Elder"]) == ["Apple", "Cherry"]
  assert filter_length(["Small", "Bigger", "Larger", "Size", "Huge"]) == ["Small"]
output: def filter_length(words):
      return [word for word in words if len(word) == 5]