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

<answer>(4, 3)</answer>