Take first element and throw out in other list, skip second, take third and skip fourth. If you reach the end of list, then go back to the start and go ahead, considering the result of taking/droping of last element (if you dropped, now you take and backward)

what shoul I do?

I don't understand the meaning of these issue

I think there is a bug)))))

I should take second numbers and then first numbers of the array

Something is going wrong for python lanhuage,
I have written the code, buth it doesnt work, why?