There are 6 shapes on a 5x5 grid. Which shape is closest to the pink 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: pink rectangle at (1, 2)
Distance from target shape to blue square at (3, 3): 3
Distance from target shape to purple trapezoid at (4, 0): 5
Distance from target shape to brown trapezoid at (3, 1): 3
Distance from target shape to green right_triangle at (2, 4): 3
Distance from target shape to red square at (2, 1): 2
Closest shape is the red square at (2, 1) with distance 2</think>

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