If your text contains 2 characters ==> it contains 3 insertionPoints.
You can refer to IP as IP[-1] and to IP as IP[-2] as well.
In my experimentation, I find that, as you say, ip means the second one(bec. ip is the first one), but ip[-1] means the last one, ip[-2] means the second to last one...
Is that true?
Is that different than I wrote?
I misunderstood you.
Thank you very much.
Have a good night.