There are 6 shapes on a 7x7 grid. Which shape is closest to the brown trapezoid 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 trapezoid at (4, 1)
Distance from target shape to green rectangle at (0, 5): 8
Distance from target shape to purple square at (2, 3): 4
Distance from target shape to red square at (6, 3): 4
Distance from target shape to gray right_triangle at (0, 6): 9
Distance from target shape to pink trapezoid at (1, 3): 5
Closest shape is the purple square at (2, 3) with distance 4</think>

<answer>(2, 3)</answer>