There are 4 shapes on a 6x6 grid. Which shape is closest to the gray 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: gray square at (5, 0)
Distance from target shape to green right_triangle at (5, 4): 4
Distance from target shape to brown square at (4, 5): 6
Distance from target shape to cyan rectangle at (5, 2): 2
Closest shape is the cyan rectangle at (5, 2) with distance 2</think>

<answer>(5, 2)</answer>