Name:Nick Taylor
Clan:University of Waterloo
Member Since:Nov 2021
Last Seen:Nov 2022
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For 2121, digits are 2,1,2,1 and after multiplication, they are 4,1,4,1.
For even lengths, multiplication starts from the leftmost digit. its even presented in examples.
I checked tests and they do not generate numbers longer than 16 digits. Why do you think they do? Do you have any example of such input?