input:             def create_song_class():
                  """Create a class Song with two instance variables, title and artist, 
                  and three methods, str(), eq(), and length(). 
  
                  Example:
                  s1 = Song('Bohemian Rhapsody', 'Queen')
                  s2 = Song('Bohemian Rhapsody', 'Queen')
                  print(str(s1))  # Output: Title: Bohemian Rhapsody\nArtist: Queen
                  print(s1 == s2)  # Output: True
                  print(s1.length())  # Output: 18
                  """
output:     class Song:
          def __init__(self, title, artist):
              self.title = title
              self.artist = artist
          
          def __str__(self):
              return f"Title: {self.title}\nArtist: {self.artist}"
          
          def __eq__(self, other):
              return self.title == other.title and self.artist == other.artist
          
          def length(self):
              return len(self.title)