There are 5 shapes on a 9x9 grid. Which shape is closest to the pink 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: pink rectangle at (7, 4)
Distance from target shape to green right_triangle at (8, 6): 3
Distance from target shape to cyan right_triangle at (5, 5): 3
Distance from target shape to purple right_triangle at (3, 2): 6
Distance from target shape to brown right_triangle at (1, 2): 8
Closest shape is the green right_triangle at (8, 6) with distance 3</think>

<answer>(8, 6)</answer>