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

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