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

<answer>(8, 4)</answer>