There are 6 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, 3)
Distance from target shape to red right_triangle at (4, 5): 2
Distance from target shape to cyan square at (4, 2): 1
Distance from target shape to pink rectangle at (2, 3): 2
Distance from target shape to purple right_triangle at (3, 4): 2
Distance from target shape to green rectangle at (0, 2): 5
Closest shape is the cyan square at (4, 2) with distance 1</think>

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