There are 5 shapes on a 10x10 grid. Which shape is closest to the purple 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: purple square at (4, 9)
Distance from target shape to gray trapezoid at (5, 4): 6
Distance from target shape to cyan square at (4, 5): 4
Distance from target shape to green right_triangle at (3, 9): 1
Distance from target shape to yellow right_triangle at (0, 5): 8
Closest shape is the green right_triangle at (3, 9) with distance 1</think>

<answer>(3, 9)</answer>