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

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