I need a very basic word-processor app for my T1. I don't need fonts or advanced formatting or anything like that. Simple text will be adequate, though more is nice

Ideally I would like to be able to open a book length text in it and be able to add and delete text as if it were a text memo.
I there such an app. I looked round, but didn't see much. If there is one, have you tested it? Thx in advance.