What is the punishment of touching a non-mahram? And do these sins disappear if he is given the sharia'h punishment?

1. Is it true that a person's sins would disappear if he is given the punishment that is decided in sharia'h? 2. What is the punishment of touching a non-mahram? And by touching, I mean handshake and in an extreme case, a hug. Not any other form of physical intimacy that could have caused arousal. Not intercourse. Just a handshake or a hug. Though it is clear that the punishment of having intercourse is 70 whips.