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, 1)
Distance from target shape to red rectangle at (5, 0): 5
Distance from target shape to yellow right_triangle at (3, 2): 3
Distance from target shape to gray trapezoid at (0, 0): 2
Closest shape is the gray trapezoid at (0, 0) with distance 2</think>

<answer>(0, 0)</answer>