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

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