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 (3, 6)
Distance from target shape to brown square at (7, 1): 9
Distance from target shape to green trapezoid at (7, 5): 5
Distance from target shape to blue square at (3, 4): 2
Distance from target shape to purple trapezoid at (6, 4): 5
Closest shape is the blue square at (3, 4) with distance 2</think>

<answer>(3, 4)</answer>