There are 5 shapes on a 3x3 grid. Which shape is closest to the gray 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: gray rectangle at (2, 2)
Distance from target shape to pink rectangle at (1, 1): 2
Distance from target shape to red trapezoid at (0, 0): 4
Distance from target shape to orange rectangle at (0, 2): 2
Distance from target shape to yellow rectangle at (2, 1): 1
Closest shape is the yellow rectangle at (2, 1) with distance 1</think>

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