There are 6 shapes on a 5x5 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 (1, 3)
Distance from target shape to purple trapezoid at (1, 1): 2
Distance from target shape to gray rectangle at (2, 4): 2
Distance from target shape to green right_triangle at (3, 0): 5
Distance from target shape to blue square at (0, 1): 3
Distance from target shape to orange rectangle at (3, 2): 3
Closest shape is the purple trapezoid at (1, 1) with distance 2</think>

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