Telegram-бот, который решает матрицы (высшая математика)

Хотел написать Telegram-бота на Python, который решает матрицы (высшая математика). При выборе размера матрицы 2х2 бот работает, но когда выбираю 3х3, будто не видит. Ошибки не выдает.

import telebot, sys

from telebot import types

bot = telebot.TeleBot(token`\`)``

A11 = ''
A12 = ''
A13 = ''
A14 = ''
A15 = ''

A21 = ''
A22 = ''
A23 = ''
A24 = ''
A25 = ''

A31 = ''
A32 = ''
A33 = ''
A34 = ''
A35 = ''

A41 = ''
A42 = ''
A43 = ''
A44 = ''
A45 = ''

A51 = ''
A52 = ''
A53 = ''
A54 = ''
A55 = ''

A112 = ''
A122 = ''
A132 = ''
A142 = ''
A152 = ''

A212 = ''
A222 = ''
A232 = ''
A242 = ''
A252 = ''

A312 = ''
A322 = ''
A332 = ''
A342 = ''
A352 = ''

result = None
result2 = None


@bot.message_handler(commands=['start'])
def start(message):
    markup = types.ReplyKeyboardMarkup(resize_keyboard=True)
    btn1 = types.KeyboardButton("2x2")
    btn2 = types.KeyboardButton("3x3")
    btn3 = types.KeyboardButton("4x4")
    btn4 = types.KeyboardButton("5x5")
    markup.add(btn1, btn2, btn3, btn4)
    send_mess = f"<b>Hello, {message.from_user.first_name} {message.from_user.last_name}!\nPlease choose with what matrix you need help)</b>"
    bot.send_message(message.chat.id, send_mess, parse_mode='html', reply_markup=markup)


@bot.message_handler(content_types=['text'])
def func(message):
    global msg
    if (message.text == "2x2"):
        msg = bot.send_message(message.chat.id, text="Ok, you choose 2x2, please write A11)")
        bot.register_next_step_handler(msg, process_A11)
    elif(message.text == "3x3"):
        msg = bot.send_message(message.chat.id, "Ok, you choose 3x3, plz write A11")
        bot.register_next_step_handler(msg, process2_A11)



def process_A11(message, result=None):
    global A11

    if result == None:
        A11 = int(message.text)
    else:
        A11 = str(result)

    msg = bot.send_message(message.chat.id, "Nice, now A12")
    bot.register_next_step_handler(msg, process_A12)


def process_A12(message):
    global A12

    A12 = int(message.text)

    msg = bot.send_message(message.chat.id, "now A21")
    bot.register_next_step_handler(msg, process_A21)


def process_A21(message):
    global A21

    A21 = int(message.text)

    msg = bot.send_message(message.chat.id, "now A22")
    bot.register_next_step_handler(msg, process_A22)


def calc2x2():
    global A11, A12, A21, A22, result

    result = str(A11 * A22 - A12 * A21)

    return result


def process_A22(message):
    global A22

    A22 = int(message.text)

    msg = bot.send_message(message.chat.id, "Your result is: " + calc2x2())


def process2_A11(message, result2=None):
    global A112

    if result2 == None:
        A112 = int(message.text)
    else:
        A112 = str(result2)

        bot.send_message(message.chat.id, "Nice, now A12")
        process2_A12(message)

def process2_A12(message):
    global A122

    A122 = int(message.text)

    msg = bot.send_message(message.chat.id, "now A13")
    bot.register_next_step_handler(msg, process2_A13)


def process2_A13(message):
    global A132

    A132 = int(message.text)

    msg = bot.send_message(message.chat.id, "now A21")
    bot.register_next_step_handler(msg, process2_A21)

def process2_A21(message):
    global A212

    A212 = int(message.text)

    msg = bot.send_message(message.chat.id, "now A22")
    bot.register_next_step_handler(msg, process2_A22)


def process2_A22(message):
    global A222

    A222 = int(message.text)

    msg = bot.send_message(message.chat.id, "now A23")
    bot.register_next_step_handler(msg, process2_A23)

def process2_A23(message):
    global A232

    A232 = int(message.text)

    msg = bot.send_message(message.chat.id, "now A31")
    bot.register_next_step_handler(msg, process2_A31)

def process2_A31(message):
    global A312

    A312 = int(message.text)

    msg = bot.send_message(message.chat.id, "now A32")
    bot.register_next_step_handler(msg, process2_A32)

def process2_A32(message):
    global A322

    A322 = int(message.text)

    msg = bot.send_message(message.chat.id, "now A33")
    bot.register_next_step_handler(msg, process2_A33)


def calc3x3():
    global A112, A122, A132, A212, A222, A232, A312, A322, A332, result2

    result2 = str(A112*A222*A332+A212*A322*A132+A312*A122*A232-A132*A222*A312-A232*A322*A112-A332*A122*A212)

    return result2

def process2_A33(message):
    global A332

    A332 = int(message.text)

    msg = bot.send_message(message.chat.id, "Your result is: " + calc3x3())

bot.polling(none_stop=True)