There are 6 shapes on a 10x10 grid. Which shape is closest to the gray 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: gray right_triangle at (4, 4)
Distance from target shape to pink square at (3, 6): 3
Distance from target shape to purple rectangle at (2, 3): 3
Distance from target shape to brown square at (5, 1): 4
Distance from target shape to yellow trapezoid at (8, 0): 8
Distance from target shape to green trapezoid at (8, 8): 8
Closest shape is the pink square at (3, 6) with distance 3</think>

<answer>(3, 6)</answer>