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

<answer>(3, 8)</answer>