There are 4 shapes on a 7x7 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, 0)
Distance from target shape to orange rectangle at (0, 5): 8
Distance from target shape to gray rectangle at (0, 2): 5
Distance from target shape to brown square at (1, 6): 8
Closest shape is the gray rectangle at (0, 2) with distance 5</think>

<answer>(0, 2)</answer>