There are 5 shapes on a 9x9 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, 4)
Distance from target shape to cyan rectangle at (2, 4): 3
Distance from target shape to green right_triangle at (1, 5): 5
Distance from target shape to blue right_triangle at (4, 2): 3
Distance from target shape to pink square at (7, 3): 3
Closest shape is the cyan rectangle at (2, 4) with distance 3</think>

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