"Ő sétál."

Translation: She walks.

[dvdvdvdvd]

I used singular they because the first word o is not gendered and apparently singular they isn't accepted

[chirelchirel]

I suppose that would be a bit too confusing for most learners as the concept of different words for singular and plural 'you' is enough to cause problems.

[Quiques95]

Is He walks a valid translation?

[imolokov]

Yes. "He/she walks" is valid.

[Hetalia...]

Why 'it walks' is incorrect? There isn't gender in Hungarian.