I lost my iPhone and I need my contacts?

I lost my iPhone 4S few days ago, is there any way to get its contacts back? I'm using another iPhone right now so I suppose I could sync it with iTunes. But, the problem is that someone else in my family used the iTunes instead so the files inside (I supposed) is her's? Or can I still get the contacts back?

Add account to sync under accounts type password then it syncs autmatically

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