I think I found a bug. I typed "Hakusikiliza" four different times with a period and without, and it wouldn't except it. I finally typed "Hakusikliza", and it passed me, but warned me that I had a typo. Is that a bug that commonly pops up?
I haven't had that bug, but just as a tip, Duolingo ignores all punctuation in accepting answers, so capitalisation and full stops shouldn't affect it ... ideally anyway.
It wasn't accepting my answer regardless of my punctuation. I'm not sure what was up there.