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

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