There are 5 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 (0, 6)
Distance from target shape to yellow trapezoid at (1, 3): 4
Distance from target shape to purple square at (5, 5): 6
Distance from target shape to brown rectangle at (7, 1): 12
Distance from target shape to green right_triangle at (0, 3): 3
Closest shape is the green right_triangle at (0, 3) with distance 3</think>

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