There are 4 shapes on a 5x5 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, 1)
Distance from target shape to orange square at (1, 0): 2
Distance from target shape to gray right_triangle at (0, 2): 1
Distance from target shape to yellow trapezoid at (3, 0): 4
Closest shape is the gray right_triangle at (0, 2) with distance 1</think>

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