What index should the root form of the expression 1258⋅12−12%0D%0A12%0D%0A5%0D%0A8%0D%0A⋅%0D%0A12%0D%0A−%0D%0A1%0D%0A2%0D%0A have?

The root form of the expression 1258⋅12−12%0D%0A12%0D%0A5%0D%0A8%0D%0A⋅%0D%0A12%0D%0A−%0D%0A1%0D%0A2%0D%0A should have an index of 0