There are 4 shapes on a 10x10 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 (3, 8)
Distance from target shape to orange right_triangle at (9, 2): 12
Distance from target shape to red trapezoid at (8, 8): 5
Distance from target shape to pink rectangle at (8, 0): 13
Closest shape is the red trapezoid at (8, 8) with distance 5</think>

<answer>(8, 8)</answer>