There are 4 shapes on a 8x8 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 (2, 6)
Distance from target shape to orange square at (3, 2): 5
Distance from target shape to brown trapezoid at (5, 2): 7
Distance from target shape to yellow rectangle at (0, 0): 8
Closest shape is the orange square at (3, 2) with distance 5</think>

<answer>(3, 2)</answer>