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 (3, 2)
Distance from target shape to red square at (2, 3): 2
Distance from target shape to yellow rectangle at (0, 7): 8
Distance from target shape to gray right_triangle at (0, 4): 5
Closest shape is the red square at (2, 3) with distance 2</think>

<answer>(2, 3)</answer>