Quick correction please!

[pythagoras.lym]

I want to say "The only good language is a dead language" in greek. I know all the Vocab but I need help with the syntax... μόνας αγαθός γλώσσα θάνατος γλώσσα εστίν Help!! Thank you very much.

[Markos]

I want to say "The only good language is a dead language" in greek.

χαῖρε φίλε,

μόνη μὲν οὖν τῶν γλωσσῶν ἡ νεκρὰ καλή.

[pythagoras.lym]

Gratias