There are 3 shapes on a 10x10 grid. Which shape is closest to the brown 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: brown right_triangle at (4, 9)
Distance from target shape to orange trapezoid at (5, 0): 10
Distance from target shape to red rectangle at (7, 3): 9
Closest shape is the red rectangle at (7, 3) with distance 9</think>

<answer>(7, 3)</answer>