There are 3 shapes on a 6x6 grid. Which shape is closest to the green rectangle 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 rectangle at (0, 4)
Distance from target shape to pink right_triangle at (3, 1): 6
Distance from target shape to cyan right_triangle at (2, 2): 4
Closest shape is the cyan right_triangle at (2, 2) with distance 4</think>

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