There are 5 shapes on a 10x10 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 (5, 5)
Distance from target shape to purple trapezoid at (5, 6): 1
Distance from target shape to orange trapezoid at (4, 1): 5
Distance from target shape to cyan rectangle at (7, 0): 7
Distance from target shape to brown square at (7, 8): 5
Closest shape is the purple trapezoid at (5, 6) with distance 1</think>

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