There are 4 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 (4, 2)
Distance from target shape to green right_triangle at (2, 1): 3
Distance from target shape to brown square at (5, 0): 3
Distance from target shape to orange square at (3, 1): 2
Closest shape is the orange square at (3, 1) with distance 2</think>

<answer>(3, 1)</answer>