There are 3 shapes on a 6x6 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 (0, 0)
Distance from target shape to cyan square at (4, 2): 6
Distance from target shape to brown right_triangle at (1, 2): 3
Closest shape is the brown right_triangle at (1, 2) with distance 3</think>

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