There are 4 shapes on a 6x6 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, 1)
Distance from target shape to purple trapezoid at (1, 4): 3
Distance from target shape to blue right_triangle at (1, 2): 1
Distance from target shape to orange square at (5, 4): 7
Closest shape is the blue right_triangle at (1, 2) with distance 1</think>

<answer>(1, 2)</answer>