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

<answer>(4, 2)</answer>