Spec commutes with cofiltered limits in concrete example

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Currently I am learning some alg. geometry and I would like to show the following claim:

Let $\mathfrak{p}$ be some prime ideal of $A$. Then $$ \varprojlim_{f\notin \mathfrak{p}} \operatorname{Spec}A_f= \operatorname{Spec}A_\mathfrak{p}.$$

It is rather straightforward to construct a map from right to left and showing that it is injective is rather easy as well, however I can't show that it is surjective.

Any hint is appreciated.