Specifically to the end of the first word in the sentence, according to the tips and notes for the Greetings skill. Also bear in mind that it's optional, so this sentence could also have been, Sunt viri domi? (or Viri domi sunt? or various other word orders).
Where are the tips and notes? I can't seem to find them anywhere. Are they not on mobile?
Right, I believe they are not on mobile. At least it used to be that way. Presumably it's still like that, but I never use mobile for much that reason (and also because I want to type on my own), so I can't be sure.