There are 5 shapes on a 5x5 grid. Which shape is closest to the purple trapezoid in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: purple trapezoid at (2, 1)
Distance from target shape to green rectangle at (1, 4): 4
Distance from target shape to blue square at (3, 4): 4
Distance from target shape to red right_triangle at (3, 1): 1
Distance from target shape to yellow trapezoid at (1, 0): 2
Closest shape is the red right_triangle at (3, 1) with distance 1</think>

<answer>(3, 1)</answer>