There are 6 shapes on a 7x7 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 (0, 1)
Distance from target shape to green rectangle at (0, 0): 1
Distance from target shape to purple trapezoid at (2, 0): 3
Distance from target shape to orange rectangle at (4, 3): 6
Distance from target shape to gray rectangle at (1, 5): 5
Distance from target shape to brown trapezoid at (1, 3): 3
Closest shape is the green rectangle at (0, 0) with distance 1</think>

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