input: 
  from typing import List
  
  
  def autocomplete(input_text: str) -> List[str]:
      """Given an input text, this function uses an autocomplete system to predict words
      based on the provided text. It first generates word candidates, then filters them,
      and finally ranks the words to return the top 5 predictions.
      >>> autocomplete("ca")
      ["car", "cat", "cake", "candidate", "caffe"]
      >>> autocomplete("hi")
      ["hiking", "history", "house", "happy", "hidden"]
      """
      # 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: str) -> List[str]:
          # Example implementation: return a list of words starting with the input text
          return [word for word in ["car", "cat", "cake", "candidate", "caffe", "hiking", "history", "house", "happy", "hidden"] if word.startswith(text)]
  
      def filter_candidates(candidates: List[str]) -> List[str]:
          # Example implementation: no filtering, just return the candidates
          return candidates
  
      def rank_words(words: List[str]) -> List[str]:
          # Example implementation: sort words alphabetically
          return sorted(words)