There are 5 shapes on a 8x8 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 (4, 2)
Distance from target shape to green trapezoid at (5, 3): 2
Distance from target shape to pink rectangle at (1, 1): 4
Distance from target shape to gray square at (7, 4): 5
Distance from target shape to red right_triangle at (7, 3): 4
Closest shape is the green trapezoid at (5, 3) with distance 2</think>

<answer>(5, 3)</answer>