There are 4 shapes on a 9x9 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 (5, 0)
Distance from target shape to pink square at (8, 7): 10
Distance from target shape to yellow square at (4, 1): 2
Distance from target shape to cyan right_triangle at (6, 3): 4
Closest shape is the yellow square at (4, 1) with distance 2</think>

<answer>(4, 1)</answer>