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

<answer>(1, 6)</answer>