There are 4 shapes on a 9x9 grid. Which shape is closest to the brown right_triangle in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: brown right_triangle at (7, 1)
Distance from target shape to pink rectangle at (0, 7): 13
Distance from target shape to gray rectangle at (5, 0): 3
Distance from target shape to orange trapezoid at (3, 1): 4
Closest shape is the gray rectangle at (5, 0) with distance 3</think>

<answer>(5, 0)</answer>