There are 6 shapes on a 4x4 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, 0)
Distance from target shape to purple trapezoid at (3, 0): 2
Distance from target shape to red square at (0, 0): 1
Distance from target shape to blue rectangle at (1, 3): 3
Distance from target shape to orange right_triangle at (3, 3): 5
Distance from target shape to green trapezoid at (1, 2): 2
Closest shape is the red square at (0, 0) with distance 1</think>

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