There are 6 shapes on a 4x4 grid. Which shape is closest to the orange 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: orange right_triangle at (1, 3)
Distance from target shape to pink trapezoid at (1, 2): 1
Distance from target shape to red rectangle at (2, 1): 3
Distance from target shape to cyan rectangle at (2, 2): 2
Distance from target shape to green rectangle at (0, 3): 1
Distance from target shape to purple trapezoid at (0, 2): 2
Closest shape is the pink trapezoid at (1, 2) with distance 1</think>

<answer>(1, 2)</answer>