"Peter does not swim in November and December."
Translation:पीटर नवंबर और दिसंबर में नहीं तैरता ।
You don't need a separate physical keyboard.
If you're on Windows, install the Hindi language support. Then you can use a hotkey to switch back and forth between typing Roman characters and typing Devanagari. Check out user "holdredial"'s July 27, 2019 response on https://forum.duolingo.com/comment/33221723. I didn't confirm these directions but IIRC they're what I did.
I would expect that the same is possible on a Mac, but I don't know how and couldn't find anyone explaining it in the forum. If you're on a Mac, try Googling "how to type hindi on a mac". This question comes up a lot. If you document the steps on the main Hindi forum, you'll help future users.