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

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