There are 4 shapes on a 10x10 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, 7)
Distance from target shape to pink trapezoid at (1, 5): 8
Distance from target shape to red right_triangle at (8, 0): 8
Distance from target shape to purple rectangle at (2, 7): 5
Closest shape is the purple rectangle at (2, 7) with distance 5</think>

<answer>(2, 7)</answer>