There are 2 shapes on a 10x10 grid. Which shape is closest to the yellow 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: yellow right_triangle at (9, 9)
Distance from target shape to red rectangle at (6, 4): 8
Closest shape is the red rectangle at (6, 4) with distance 8</think>

<answer>(6, 4)</answer>