There are 5 shapes on a 8x8 grid. Which shape is closest to the orange 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: orange right_triangle at (7, 5)
Distance from target shape to cyan right_triangle at (6, 5): 1
Distance from target shape to purple right_triangle at (4, 0): 8
Distance from target shape to yellow trapezoid at (5, 5): 2
Distance from target shape to brown rectangle at (0, 3): 9
Closest shape is the cyan right_triangle at (6, 5) with distance 1</think>

<answer>(6, 5)</answer>