There are 6 shapes on a 10x10 grid. Which shape is closest to the gray 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: gray square at (6, 9)
Distance from target shape to cyan right_triangle at (5, 1): 9
Distance from target shape to brown trapezoid at (8, 2): 9
Distance from target shape to pink right_triangle at (4, 5): 6
Distance from target shape to purple trapezoid at (4, 4): 7
Distance from target shape to yellow right_triangle at (0, 4): 11
Closest shape is the pink right_triangle at (4, 5) with distance 6</think>

<answer>(4, 5)</answer>