There are 5 shapes on a 4x4 grid. Which shape is closest to the brown 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: brown square at (3, 2)
Distance from target shape to green square at (0, 1): 4
Distance from target shape to gray trapezoid at (0, 0): 5
Distance from target shape to blue trapezoid at (0, 3): 4
Distance from target shape to orange right_triangle at (3, 3): 1
Closest shape is the orange right_triangle at (3, 3) with distance 1</think>

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