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I've became an analyst after completing several courses on https://stepik.org/ (one of JB educational projects).

Now I am waiting for Data Science track and projects on Hyperskill.

Hi! Thanks for reply. I started learning few days ago, I have no prior knowledge or background in computer science so maybe that's why this is so difficult for me. I follow theory and try to figure out solutions.
I installed Pycharm on my computer. When I run the code in Repl.it or in Pycharm, I get the correct solution ['p', 'y', 't', 'h', 'o', 'n'] but when I check for the answer, it says that it's not correct. Also, when I try to print the variable string, it says "NameError: name 'string' is not defined". I'm probably not seeing something obvious. I would be grateful for any hints.

Just remember, input("Write something") is the same as:

print("Write something", end='') input()

You should try your code in your computer or a page like this online Python 3 IDE before send it to the platform.

EDIT: sorry for my English

This is how I solved it at the end:

https://codeberg.org/arehandoro/Python/src/branch/master/tic_tac_toe/tictactoe.py

Hyperskill is a child of the Stepik.org project, and slow work is a hereditary disease. Since this problem could not be solved on Stepik, then one should not expect its solution on Hyperskill.