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

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