The code is giving error for input 7 and it works for other numbers

Question

https://code.sololearn.com/ctueJTMYB06i/?ref=app

For big numbers also it's showing the same, it should show execution timed out I think ,but where is the wrong happening

Answer 1

when you remarked this line
#a3.insert(0,z)

This will happen
"IndexError: list index out of range"
the problem is with this code "a3.pop(0)"

so remove the remark &
try it to look into other problems you might have

# Keep learning & happy coding :D