There are 4 shapes on a 4x4 grid. Which shape is closest to the orange square in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: orange square at (3, 2)
Distance from target shape to brown square at (3, 1): 1
Distance from target shape to green right_triangle at (0, 2): 3
Distance from target shape to pink rectangle at (2, 3): 2
Closest shape is the brown square at (3, 1) with distance 1</think>

<answer>(3, 1)</answer>