There are 3 shapes on a 8x8 grid. Which shape is closest to the brown 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: brown right_triangle at (6, 2)
Distance from target shape to gray rectangle at (6, 6): 4
Distance from target shape to cyan rectangle at (3, 3): 4
Closest shape is the gray rectangle at (6, 6) with distance 4</think>

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