Dragon Wing begonias
Sunny location, not too hot, lightly fertilized (1/4 strength), keep watered. They won't look as good as outdoors, but should survive.
Also, it goes without saying, don't bring them in if they have insects or disease.
Here are a couple of links:
Thanks. Is it helpful to trim back to a joint where new growth has begun?
If your plant is too large, or too leggy, you might want to consider rooting a cutting. The links I gave tell you how.