text: from app import handler
  from app import line_bot_api, handler
  
  from linebot.models import (
      MessageEvent, TextMessage, TextSendMessage
  )
  import random
  
  @handler.add(MessageEvent, message=TextMessage)
  def message_text_echo(event):
      
      message_text = event.message.text
  
      line_bot_api.reply_message(
          event.reply_token,
          TextSendMessage(text=message_text)
      )
  