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NOW you've opened a can of worms talking about input current! An AC to DC converter (aka AC adapter) "takes in" the same POWER as it outputs (minus the inefficiency of the converter). Power is equal to V*A (not strictly true, but close enough for our purposes here). In the US, input voltage is about 120V. So if it outputs 3.5A at 5V (equals 17.5 Watts of power) then it takes in the same amount of power, and the current equals Amps=Power/Voltage => 17.5/120 = .146 A (which is the same as 146 milliamps)
Summary: Ac input: 146mA @ 120V => DC output 3.5A @ 5v (ignoring inefficiencies in the adaptor). Now you know how to read AC adaptor specifications!
But that's a lesson for another day, I think. You've got the basics.
Congrats!
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