There are 5 shapes on a 10x10 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 (5, 4)
Distance from target shape to orange right_triangle at (8, 2): 5
Distance from target shape to brown right_triangle at (2, 0): 7
Distance from target shape to blue right_triangle at (2, 5): 4
Distance from target shape to purple right_triangle at (0, 3): 6
Closest shape is the blue right_triangle at (2, 5) with distance 4</think>

<answer>(2, 5)</answer>