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Oh. I remembered something about BadManners teaching me "по" so long ago when I was writing fairytales about Oleg, so I thought it was normal.

I'm assuming it's accusative because the взять from the previous clause carries over. But what exactly about that is not "standard" Russian?

Here is how I would translate it:

The silver hoof

In our factory lived an old man known as Kokovanya. Kokovanya's family had already passed on; he thought to take an orphan as a child. He asked...