There are 5 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 (5, 4)
Distance from target shape to red rectangle at (7, 2): 4
Distance from target shape to orange square at (2, 5): 4
Distance from target shape to blue square at (7, 8): 6
Distance from target shape to purple trapezoid at (9, 4): 4
Closest shape is the red rectangle at (7, 2) with distance 4</think>

<answer>(7, 2)</answer>