There are 5 shapes on a 7x7 grid. Which shape is closest to the pink rectangle 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 rectangle at (6, 1)
Distance from target shape to red right_triangle at (5, 2): 2
Distance from target shape to purple rectangle at (5, 4): 4
Distance from target shape to orange square at (3, 3): 5
Distance from target shape to brown right_triangle at (6, 0): 1
Closest shape is the brown right_triangle at (6, 0) with distance 1</think>

<answer>(6, 0)</answer>