bp

import telebot
from random import *

bot = telebot.TeleBot("819452497:AAEyEtgrW50WLM9sR1Kp37VeICQGNBFQRhY")

a = -1
b = -1

@bot.message_handler(content_types=["text"])
def check(mes):
    global a, b
    id = mes.chat.id
    text = mes.text
    if text == "/start":
        if id != a and id != b:
            bot.send_message(id, "Enter a password:")
        else:
            bot.send_message(id, "You have already entered the chat.")
    elif text != "/quit":
        if id != a and id != b:
            if text == "hjPN31DP":
                if a == -1:
                    a = id
                    bot.send_message(id, "Successful!")
                    if b != -1:
                        bot.send_message(b, "The second user has entered!")
                elif b == -1:
                    b = id
                    bot.send_message(id, "Successful!")
                    if a != -1:
                        bot.send_message(a, "The second user has entered!")
                else:
                    bot.send_message(id, "Both users have already entered the chat. Come again later. Sorry.")
            else:
                bot.send_message(id, "Invalid password. Try again.")
        else:
            if id == a:
                if b == -1:
                    bot.send_message(id, "Wait for the second user to enter...")
                else:
                    bot.send_message(b, text)
            else:
                if a == -1:
                    bot.send_message(id, "Wait for the second user to enter...")
                else:
                    bot.send_message(a, text)
    else:
        if id == a:
            a = -1
            bot.send_message(id, "You have quit the chat.")
        elif id == b:
            b = -1
            bot.send_message(id, "You have quit the chat.")
        else:
            bot.send_message(id, "You haven't entered the chat yet.")


bot.polling(none_stop=True)