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Solutions; As can be seen from the figure, solenoid and magnet attract each other, so the magnetic poles of the two magnets should be opposite;

Let terminal A be the N pole and the end near the solenoid be the S pole, then the left side of the solenoid should be the N pole, which can be obtained by the right-hand spiral law. The current flows in from the right side, so the right side of the power supply is the positive pole;

Let terminal B be the S pole and the end near the solenoid be the N pole, then the left side of the solenoid should be the S pole and the right side should be the N pole, which can be obtained by the right-hand spiral rule. The current flows in from the left side, so the left side of the power supply is the positive pole.

So the answer is: s (n); Negative (positive).