There are 5 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 (2, 3)
Distance from target shape to yellow rectangle at (1, 0): 4
Distance from target shape to brown rectangle at (6, 0): 7
Distance from target shape to gray rectangle at (0, 2): 3
Distance from target shape to red trapezoid at (6, 3): 4
Closest shape is the gray rectangle at (0, 2) with distance 3</think>

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