There are 3 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 (0, 0)
Distance from target shape to green trapezoid at (1, 3): 4
Distance from target shape to red rectangle at (3, 3): 6
Closest shape is the green trapezoid at (1, 3) with distance 4</think>

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