There are 6 shapes on a 10x10 grid. Which shape is closest to the pink 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: pink right_triangle at (3, 8)
Distance from target shape to yellow trapezoid at (4, 6): 3
Distance from target shape to cyan right_triangle at (0, 9): 4
Distance from target shape to purple rectangle at (6, 7): 4
Distance from target shape to gray square at (6, 0): 11
Distance from target shape to brown trapezoid at (3, 1): 7
Closest shape is the yellow trapezoid at (4, 6) with distance 3</think>

<answer>(4, 6)</answer>