There are 5 shapes on a 7x7 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 (0, 2)
Distance from target shape to gray rectangle at (2, 1): 3
Distance from target shape to purple trapezoid at (6, 3): 7
Distance from target shape to red rectangle at (5, 2): 5
Distance from target shape to green right_triangle at (1, 4): 3
Closest shape is the gray rectangle at (2, 1) with distance 3</think>

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