There are 5 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 (0, 4)
Distance from target shape to purple square at (3, 6): 5
Distance from target shape to orange trapezoid at (1, 7): 4
Distance from target shape to green square at (1, 3): 2
Distance from target shape to blue square at (6, 2): 8
Closest shape is the green square at (1, 3) with distance 2</think>

<answer>(1, 3)</answer>