There are 4 shapes on a 10x10 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 (3, 6)
Distance from target shape to red rectangle at (3, 8): 2
Distance from target shape to brown right_triangle at (4, 3): 4
Distance from target shape to cyan rectangle at (7, 0): 10
Closest shape is the red rectangle at (3, 8) with distance 2</think>

<answer>(3, 8)</answer>