There are 6 shapes on a 8x8 grid. Which shape is closest to the red 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: red right_triangle at (4, 2)
Distance from target shape to blue rectangle at (6, 0): 4
Distance from target shape to orange right_triangle at (3, 5): 4
Distance from target shape to yellow square at (0, 4): 6
Distance from target shape to pink rectangle at (2, 4): 4
Distance from target shape to brown square at (3, 0): 3
Closest shape is the brown square at (3, 0) with distance 3</think>

<answer>(3, 0)</answer>