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

<answer>(7, 1)</answer>