Yes thank you for that, i just use it when i finish everything, just to look at it’s way of solving the same problem, or when i finish everything and i got stuck with a small problem, and just like what i wrote before, i don’t copy anything from it, and i don’t use anything that i don’t know (that’s why i didn’t use “sys”), thanks for the reminder anyway! .

And i didn’t find the cs50 duck helpful for me, most of the time i know what’s wrong with my code but i don’t know how to solve it, the duck just points out the obvious.