There are 6 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 (4, 5)
Distance from target shape to yellow trapezoid at (4, 7): 2
Distance from target shape to brown right_triangle at (1, 4): 4
Distance from target shape to blue trapezoid at (1, 5): 3
Distance from target shape to orange trapezoid at (7, 3): 5
Distance from target shape to purple trapezoid at (4, 3): 2
Closest shape is the yellow trapezoid at (4, 7) with distance 2</think>

<answer>(4, 7)</answer>