How to reject an interview offer from the same hospital that just hired me for another position.

Applied to two different positions at the same hospital. Got an interview and a job offer for one which I accepted. Got another call for an interview for the second after the fact (this was my top choice but I’ve already accepted the other)..Now how do I decline this offer. Truth is I might apply to it again in the future but rn with my schedule, I’ll just work with the one I have to keep my foot in the door. Anyways can someone please tell me how to politely reject the interview offer

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