There are 4 shapes on a 7x7 grid. Which shape is closest to the brown 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: brown rectangle at (0, 0)
Distance from target shape to yellow rectangle at (3, 3): 6
Distance from target shape to gray square at (4, 2): 6
Distance from target shape to red right_triangle at (5, 4): 9
Closest shape is the yellow rectangle at (3, 3) with distance 6</think>

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