from vk_api.longpoll import VkLongPoll, VkEventType
import vk_api
import random

vk_session = vk_api.VkApi(token='ХХХХХХХХХХХХХХХХХХХХХХХХХХХХХХХХХХХХХХХХХХХХХХ')

longpoll = VkLongPoll(vk_session)
vk = vk_session.get_api()

for event in longpoll.listen():
    if event.type == VkEventType.MESSAGE_NEW and event.to_me and event.text:
        if event.text.lower() == "XXXXXXXXXXXXXXXXXXXXXXXX":
            if event.from_user:
                vk.messages.send(
                    user_id=event.user_id,
                    message='XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX',
                    random_id = str(random.randint(1, 1000000000))
                    )