There are 6 shapes on a 4x4 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 (0, 3)
Distance from target shape to cyan square at (2, 0): 5
Distance from target shape to orange right_triangle at (1, 0): 4
Distance from target shape to brown square at (2, 2): 3
Distance from target shape to gray right_triangle at (0, 2): 1
Distance from target shape to purple trapezoid at (0, 0): 3
Closest shape is the gray right_triangle at (0, 2) with distance 1</think>

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