Extension/coercion of finite rings & fields

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Hi ...

again harping on my theme of p-adics: here is a characteristic-p toy model of the problem I had here. Will someone please tell me how to do what this code is trying to do?!!

sage: K.<X> = GF(3^2,name='X'); # creates (residue) field which is GF(3)[X]
sage: R = IntegerModRing(3^2)[X];  # extends Z/p^2 by that same X to form quadratic extn - seemingly successfully
sage: print R(X+5); # I try to use X but it still treats it like an "alien" quantity in R ....

thanks!!