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 (3, 2)
Distance from target shape to yellow square at (5, 2): 2
Distance from target shape to green trapezoid at (4, 2): 1
Distance from target shape to blue square at (0, 3): 4
Closest shape is the green trapezoid at (4, 2) with distance 1</think>

<answer>(4, 2)</answer>