There are 6 shapes on a 9x9 grid. Which shape is closest to the red 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: red square at (3, 1)
Distance from target shape to blue square at (0, 2): 4
Distance from target shape to green square at (2, 5): 5
Distance from target shape to purple right_triangle at (8, 2): 6
Distance from target shape to cyan square at (0, 5): 7
Distance from target shape to yellow trapezoid at (5, 4): 5
Closest shape is the blue square at (0, 2) with distance 4</think>

<answer>(0, 2)</answer>