The Bidirectional Pivot Conveyor

A conveyor belt is represented as a sequence of items. A robotic arm always picks the item at the 'Pivot' (index floor(length/2)). When an item is picked, the belt must be rebalanced: 1. If an 'L' command arrives, a new item is added to the left end. 2. If an 'R' command arrives, a new item is added to the right end. 3. If a 'P' command arrives, the robot removes the item at the current Pivot. 4. After removal, the remaining items shift to close the gap. If the new length is L, the next pivot is floor(L/2). Input: N commands. Each is `L item`, `R item`, or `P`. Output: For each `P`, print the item removed. Finally, print the items remaining on the belt from left to right. Example: Input: 6 L A R B L C P P R D Output: A C B D