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The simulator obtains "client $B$'s input" in the same way the simulator obtains $\:\{\hspace{-0.03 in}0,\hspace{-0.04 in}0\hspace{-0.03 in}\}\;$. Even in the real world, the server computes its response without using any secrets, that response is the only message $B$ receives, and (from your description) no other party gives any output. $\:$ Thus, it ...

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