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

<answer>(6, 2)</answer>