There are 3 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 (4, 6)
Distance from target shape to red square at (7, 0): 9
Distance from target shape to cyan right_triangle at (6, 0): 8
Closest shape is the cyan right_triangle at (6, 0) with distance 8</think>

<answer>(6, 0)</answer>