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

<answer>(9, 1)</answer>