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

<answer>(3, 5)</answer>