There are 5 shapes on a 9x9 grid. Which shape is closest to the yellow square 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 square at (4, 5)
Distance from target shape to purple right_triangle at (1, 5): 3
Distance from target shape to brown square at (6, 8): 5
Distance from target shape to gray rectangle at (7, 0): 8
Distance from target shape to orange rectangle at (0, 2): 7
Closest shape is the purple right_triangle at (1, 5) with distance 3</think>

<answer>(1, 5)</answer>