There are 5 shapes on a 3x3 grid. Which shape is closest to the green rectangle in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: green rectangle at (0, 1)
Distance from target shape to pink square at (2, 2): 3
Distance from target shape to gray right_triangle at (1, 2): 2
Distance from target shape to brown trapezoid at (2, 0): 3
Distance from target shape to purple square at (1, 1): 1
Closest shape is the purple square at (1, 1) with distance 1</think>

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