There are 6 shapes on a 9x9 grid. Which shape is closest to the yellow 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: yellow right_triangle at (4, 4)
Distance from target shape to pink right_triangle at (4, 2): 2
Distance from target shape to gray square at (0, 5): 5
Distance from target shape to brown right_triangle at (4, 6): 2
Distance from target shape to red rectangle at (6, 5): 3
Distance from target shape to blue square at (5, 0): 5
Closest shape is the pink right_triangle at (4, 2) with distance 2</think>

<answer>(4, 2)</answer>