There are 3 shapes on a 6x6 grid. Which shape is closest to the brown square 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 square at (5, 1)
Distance from target shape to yellow rectangle at (5, 0): 1
Distance from target shape to green right_triangle at (1, 3): 6
Closest shape is the yellow rectangle at (5, 0) with distance 1</think>

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