There are 5 shapes on a 3x3 grid. Which shape is closest to the pink 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: pink square at (2, 2)
Distance from target shape to brown right_triangle at (0, 1): 3
Distance from target shape to yellow right_triangle at (1, 1): 2
Distance from target shape to purple square at (2, 1): 1
Distance from target shape to cyan square at (0, 0): 4
Closest shape is the purple square at (2, 1) with distance 1</think>

<answer>(2, 1)</answer>