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

<answer>(3, 2)</answer>