Mains adapter problem

I have an Altai mains adapter. Input 240v ac Output 3,4.5,6,7.5,9,12 v dc 300mA MAX

It has a polarity plug where you plug in the lead.

I want to run a 3v Fuji film digital camera.

Do i plug in the plug so the + goes to the - or the + goes to the +?

Does it matter?

What happens if i plug it in the wrong way? Would that harm the camera?

Thanks in advance.

John

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