code: def parse_transcript_number(effect):
      
      name = name_of_associated_transcript(effect)
      if "-" not in name:
          return 0
      parts = name.split("-")
      last_part = parts[-1]
      if last_part.isdigit():
          return int(last_part)
      else:
          return 0
docs: Try to parse the number at the end of a transcript name associated with
      an effect.
  
      e.g. TP53-001 returns the integer 1.
  
      Parameters
      ----------
      effect : subclass of MutationEffect
  
      Returns int