There are 3 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 (0, 1)
Distance from target shape to red square at (0, 3): 2
Distance from target shape to pink trapezoid at (1, 3): 3
Closest shape is the red square at (0, 3) with distance 2</think>

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