There are 6 shapes on a 10x10 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 (7, 1)
Distance from target shape to orange square at (9, 9): 10
Distance from target shape to red right_triangle at (3, 0): 5
Distance from target shape to brown rectangle at (2, 4): 8
Distance from target shape to pink right_triangle at (7, 5): 4
Distance from target shape to gray square at (3, 7): 10
Closest shape is the pink right_triangle at (7, 5) with distance 4</think>

<answer>(7, 5)</answer>