There are 6 shapes on a 10x10 grid. Which shape is closest to the red 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: red right_triangle at (0, 7)
Distance from target shape to green rectangle at (0, 0): 7
Distance from target shape to pink right_triangle at (2, 8): 3
Distance from target shape to yellow right_triangle at (9, 9): 11
Distance from target shape to gray rectangle at (6, 0): 13
Distance from target shape to orange square at (8, 7): 8
Closest shape is the pink right_triangle at (2, 8) with distance 3</think>

<answer>(2, 8)</answer>