There are 6 shapes on a 9x9 grid. Which shape is closest to the pink 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: pink square at (6, 4)
Distance from target shape to yellow square at (5, 6): 3
Distance from target shape to gray right_triangle at (6, 7): 3
Distance from target shape to brown rectangle at (0, 6): 8
Distance from target shape to blue right_triangle at (4, 6): 4
Distance from target shape to cyan right_triangle at (0, 3): 7
Closest shape is the yellow square at (5, 6) with distance 3</think>

<answer>(5, 6)</answer>