Water damaged iphone 4s, everything, including touchscreen works except the screen?

I dropped my iphone in the toilet yesterday, i put it in rice right away. Its been 24 hours, so I took it out, everything but the screen work. It vibrates, it makes the charging noise, hell it even slides to unlock and I can hear it do so! Its just the screen is black still. I restored it thinking it would work, it didn't do anything. Should I restore it again? Should I leave it in rice more? Should I replace the screen for $80 or whatever? Should I replace the phone at the apple store (Hoping its free)? Please advise me on what to do.

Take it to apple store

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