input: def autocomplete(input_text):
      """This function takes an input text and returns the top 5 predicted words based on the input text.
      It uses a series of helper functions to generate possible candidates, filter them, and then rank them.
      The top 5 ranked words are returned as the output.
      
      Examples:
      >>> autocomplete("hel")
      ['hello', 'help', 'helper', 'helm', 'helix']
      >>> autocomplete("pro")
      ['project', 'process', 'problem', 'program', 'production']
      """
output:     from typing import List
  
      def generate_candidates(input_text: str) -> List[str]:
          # Dummy implementation to generate candidates
          return [input_text + chr(i) for i in range(97, 123)]
  
      def filter_candidates(candidates: List[str], input_text: str) -> List[str]:
          # Dummy implementation to filter candidates
          return [candidate for candidate in candidates if candidate.startswith(input_text)]
  
      def rank_candidates(candidates: List[str]) -> List[str]:
          # Dummy implementation to rank candidates
          return sorted(candidates)[:5]
  
      candidates = generate_candidates(input_text)
      filtered_candidates = filter_candidates(candidates, input_text)
      ranked_candidates = rank_candidates(filtered_candidates)
      return ranked_candidates