There are 5 shapes on a 4x4 grid. Which shape is closest to the pink 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: pink square at (1, 3)
Distance from target shape to red rectangle at (0, 3): 1
Distance from target shape to brown trapezoid at (2, 3): 1
Distance from target shape to orange rectangle at (0, 0): 4
Distance from target shape to yellow right_triangle at (3, 0): 5
Closest shape is the red rectangle at (0, 3) with distance 1</think>

<answer>(0, 3)</answer>