There are 5 shapes on a 8x8 grid. Which shape is closest to the orange 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: orange square at (3, 7)
Distance from target shape to yellow square at (6, 1): 9
Distance from target shape to purple square at (0, 4): 6
Distance from target shape to pink rectangle at (2, 2): 6
Distance from target shape to red right_triangle at (1, 3): 6
Closest shape is the purple square at (0, 4) with distance 6</think>

<answer>(0, 4)</answer>