There are 2 shapes on a 6x6 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, 5)
Distance from target shape to gray rectangle at (5, 1): 5
Closest shape is the gray rectangle at (5, 1) with distance 5</think>

<answer>(5, 1)</answer>