There are 4 shapes on a 5x5 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 (3, 1)
Distance from target shape to orange square at (3, 2): 1
Distance from target shape to brown right_triangle at (2, 4): 4
Distance from target shape to green rectangle at (1, 0): 3
Closest shape is the orange square at (3, 2) with distance 1</think>

<answer>(3, 2)</answer>