There are 5 shapes on a 4x4 grid. Which shape is closest to the yellow right_triangle in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: yellow right_triangle at (3, 1)
Distance from target shape to purple right_triangle at (0, 2): 4
Distance from target shape to pink trapezoid at (3, 3): 2
Distance from target shape to orange square at (2, 2): 2
Distance from target shape to red trapezoid at (3, 0): 1
Closest shape is the red trapezoid at (3, 0) with distance 1</think>

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