input: 
  def autocomplete(input_text):
      """Given an input text, this function will predict words that could be completed
      based on the input text. It will generate word candidates, filter them, rank them,
      and return the top 5 words as a list.
      >>> autocomplete("hel")
      ['hello', 'help', 'hell', 'helm', 'helmet']
      >>> autocomplete("app")
      ['apple', 'application', 'app', 'appendix', 'appliance']
      """
      # Generate the word candidates
      word_candidates = generate_candidates(input_text)
      # Filter the word candidates 
      filtered_words = filter_candidates(word_candidates)
      # Rank the words and return the top 5 
      sorted_words = rank_words(filtered_words)
      return sorted_words[:5]
  
output:     # Placeholder functions for generating, filtering, and ranking candidates
      def generate_candidates(text):
          # Dummy implementation for demonstration purposes
          return [text + 'lo', text + 'lp', text + 'l', text + 'm', text + 'met']
      
      def filter_candidates(candidates):
          # Dummy implementation for demonstration purposes
          return candidates
      
      def rank_words(words):
          # Dummy implementation for demonstration purposes
          return sorted(words)