There are 5 shapes on a 10x10 grid. Which shape is closest to the pink right_triangle in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: pink right_triangle at (7, 7)
Distance from target shape to green trapezoid at (3, 0): 11
Distance from target shape to brown square at (3, 9): 6
Distance from target shape to yellow trapezoid at (5, 3): 6
Distance from target shape to gray square at (9, 1): 8
Closest shape is the brown square at (3, 9) with distance 6</think>

<answer>(3, 9)</answer>