There are 3 shapes on a 8x8 grid. Which shape is closest to the brown 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: brown square at (4, 0)
Distance from target shape to gray right_triangle at (6, 5): 7
Distance from target shape to pink right_triangle at (0, 0): 4
Closest shape is the pink right_triangle at (0, 0) with distance 4</think>

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