There are 5 shapes on a 8x8 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 (5, 3)
Distance from target shape to red square at (3, 2): 3
Distance from target shape to yellow rectangle at (6, 7): 5
Distance from target shape to blue right_triangle at (6, 0): 4
Distance from target shape to cyan rectangle at (5, 6): 3
Closest shape is the red square at (3, 2) with distance 3</think>

<answer>(3, 2)</answer>