There are 6 shapes on a 10x10 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 (8, 4)
Distance from target shape to purple right_triangle at (9, 1): 4
Distance from target shape to yellow square at (0, 0): 12
Distance from target shape to brown square at (1, 2): 9
Distance from target shape to blue square at (6, 1): 5
Distance from target shape to green right_triangle at (5, 9): 8
Closest shape is the purple right_triangle at (9, 1) with distance 4</think>

<answer>(9, 1)</answer>