Please read my answer again.  Your code does not do what you _think_ it does.  It does what I said it does instead.

>>> a = input()
1010
>>> print(a)
1010
>>> print(type(a))
<class 'str'>

The input you're working with is NOT A LIST OF INTEGERS.  It's a string of "0" and "1" CHARACTERS.

And I already told you how to repair that too:

>>> a = list(map(int, a))
>>> a
[1, 0, 1, 0]
>>> type(a)
<class 'list'>