There are 3 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 (4, 1)
Distance from target shape to cyan right_triangle at (6, 2): 3
Distance from target shape to gray rectangle at (5, 0): 2
Closest shape is the gray rectangle at (5, 0) with distance 2</think>

<answer>(5, 0)</answer>