You're supposed to concatenate all the input numbers, to create a message that has hundreds or thousands of digits; then RSA-encrypt that number.
That's not how it works...
In modern protocols, you don't encrypt at all with RSA. You use a key exchange, and if you use RSA, you only use it as a signature algorithm to initiate the key exchange.
If you happen to want to encrypt with RSA, which you usually shouldn't, you first use a padding algorithm (the modern variant of that is called RSA-OAEP) with which you prepare and then encrypt a random key. That key you then use for symmetric encryption.
My article isn't written as a step-by-step tutorial and doesn't come with example numbers. But mine fills in certain things that xnacly doesn't cover: random prime generation, efficiently calculating the decryption exponent d from (n, e) by using a modular inverse, using modular exponentiation instead of power-then-modulo.
By the way for Python, modular exponentiation is pow(x, y, m) (since 3.0), and modular inverse is pow(x, -1, m) (since 3.8, Oct 2019). https://docs.python.org/3/library/functions.html#pow