There are 3 shapes on a 6x6 grid. Which shape is closest to the green 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: green right_triangle at (3, 3)
Distance from target shape to brown rectangle at (3, 2): 1
Distance from target shape to pink right_triangle at (5, 4): 3
Closest shape is the brown rectangle at (3, 2) with distance 1</think>

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