There are 5 shapes on a 8x8 grid. Which shape is closest to the brown 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: brown right_triangle at (6, 3)
Distance from target shape to green square at (4, 0): 5
Distance from target shape to cyan square at (3, 4): 4
Distance from target shape to yellow trapezoid at (6, 0): 3
Distance from target shape to purple right_triangle at (3, 2): 4
Closest shape is the yellow trapezoid at (6, 0) with distance 3</think>

<answer>(6, 0)</answer>