There are 4 shapes on a 10x10 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 (5, 8)
Distance from target shape to green trapezoid at (1, 0): 12
Distance from target shape to brown right_triangle at (2, 4): 7
Distance from target shape to cyan rectangle at (6, 0): 9
Closest shape is the brown right_triangle at (2, 4) with distance 7</think>

<answer>(2, 4)</answer>