I Have a Random Exchange System

The protagonist travels to another world and obtains a random exchange system, which can be exchanged for anything that belongs to him. The protagonist picked up the water cup next to him and exchanged it for a heaven-level skill. The protagonist picked up the chair next to him and exchanged it for a bottle of the magic medicine "Erguotou". The protagonist looked at his quilt and exchanged it for a pair of AK47. The protagonist then looked at his bed. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.