There are 6 shapes on a 9x9 grid. Which shape is closest to the gray square 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 square at (5, 1)
Distance from target shape to red trapezoid at (0, 2): 6
Distance from target shape to green rectangle at (6, 8): 8
Distance from target shape to brown right_triangle at (5, 5): 4
Distance from target shape to orange trapezoid at (1, 6): 9
Distance from target shape to yellow trapezoid at (8, 3): 5
Closest shape is the brown right_triangle at (5, 5) with distance 4</think>

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