telegram app which just forwards messages

telegram_app.py

from telethon.sync import TelegramClient, events

api_id= ''
api_hash = ''

mvp_usernames = ['abcd']
source_channel_id = 9999 # # set source channel id here
dest_channel_id = 9999 # set dest channel id here
with TelegramClient('name', api_id, api_hash) as client:

   @client.on(events.NewMessage(chats=source_channel_id))
   async def handler(event):
        sender = await event.get_sender()
        if sender.username in mvp_usernames and event.raw_text.strip() != '':
            await client.send_message(dest_channel_id, '{}: {}'.format(sender.first_name, event.raw_text))

   client.run_until_disconnected()