input: from typing import Dict, Any
  
  def html_to_text(html_string: str) -> str:
      """ Converts HTML string to plain text by removing all HTML tags.
      
      >>> html_to_text('<p>Hello, <b>world</b>!</p>')
      'Hello, world!'
      >>> html_to_text('<h1>Title</h1><p>This is a paragraph.</p>')
      'TitleThis is a paragraph.'
      """
output:     import re
      return re.sub(r'<[^>]+>', '', html_string)