There are 5 shapes on a 10x10 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 (9, 2)
Distance from target shape to red square at (2, 9): 14
Distance from target shape to gray right_triangle at (4, 6): 9
Distance from target shape to brown rectangle at (0, 3): 10
Distance from target shape to green right_triangle at (4, 9): 12
Closest shape is the gray right_triangle at (4, 6) with distance 9</think>

<answer>(4, 6)</answer>