There are 4 shapes on a 6x6 grid. Which shape is closest to the pink 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: pink square at (1, 2)
Distance from target shape to gray trapezoid at (5, 3): 5
Distance from target shape to green right_triangle at (1, 4): 2
Distance from target shape to blue rectangle at (3, 0): 4
Closest shape is the green right_triangle at (1, 4) with distance 2</think>

<answer>(1, 4)</answer>