old_contents: from app import create_app
  
  application = create_app()
  
  if __name__ == '__main__':
      port = int(os.environ.get('PORT', 5000))
      application.run(host='0.0.0.0', port=port)
new_contents: 
  import os
  
  from app import create_app
  
  application = create_app()
  
  if __name__ == '__main__':
      port = int(os.environ.get('PORT', 5000))
      application.run(host='0.0.0.0', port=port)
subject: Add missing import