There are 6 shapes on a 5x5 grid. Which shape is closest to the yellow square 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 square at (4, 4)
Distance from target shape to orange square at (0, 4): 4
Distance from target shape to purple trapezoid at (0, 1): 7
Distance from target shape to green right_triangle at (3, 4): 1
Distance from target shape to gray trapezoid at (1, 3): 4
Distance from target shape to brown trapezoid at (4, 0): 4
Closest shape is the green right_triangle at (3, 4) with distance 1</think>

<answer>(3, 4)</answer>