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

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