There are 3 shapes on a 8x8 grid. Which shape is closest to the gray 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: gray rectangle at (2, 5)
Distance from target shape to brown rectangle at (4, 2): 5
Distance from target shape to red right_triangle at (5, 7): 5
Closest shape is the brown rectangle at (4, 2) with distance 5</think>

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