There are 4 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 (0, 1)
Distance from target shape to pink right_triangle at (1, 0): 2
Distance from target shape to blue square at (3, 2): 4
Distance from target shape to purple rectangle at (2, 0): 3
Closest shape is the pink right_triangle at (1, 0) with distance 2</think>

<answer>(1, 0)</answer>