There are 3 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 (4, 0)
Distance from target shape to gray right_triangle at (4, 8): 8
Distance from target shape to cyan rectangle at (0, 9): 13
Closest shape is the gray right_triangle at (4, 8) with distance 8</think>

<answer>(4, 8)</answer>