In his grandfather's notebook Nicola found a description of an old game called "Bulls and Cows" , which was popular amongst ancient humans. He wants to try and play it with Stephan, but Nicola does not losing games. That's where we come in!
The host thinks up a 4-digits sequence. The digits must all be different. Then, in turn, you try to guess the sequence. If the matching digits are on their right positions, they are called "bulls", when they are on different positions, they are "cows". The host tells you how many "bulls" and "cows" you've guessed. You should attempt to solve the code in eight turns (it is however, possible in seven turns).
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CheckiO Extensions allow you to use local files to solve missions. More info in a blog post.
In order to install CheckiO client you'll need installed Python (version at least 3.8)
Install CheckiO Client first:
pip3 install checkio_client
Configure your tool
checkio --domain=py config --key=
Sync solutions into your local folder
(in beta testing) Launch local server so your browser can use it and sync solution between local file end extension on the fly. (doesn't work for safari)
checkio serv -d
Alternatevly, you can install Chrome extension or FF addon
checkio install-plugin --ff
checkio install-plugin --chromium