There are 6 shapes on a 8x8 grid. Which shape is closest to the cyan 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: cyan right_triangle at (6, 2)
Distance from target shape to gray right_triangle at (6, 6): 4
Distance from target shape to pink trapezoid at (4, 4): 4
Distance from target shape to green trapezoid at (3, 5): 6
Distance from target shape to blue rectangle at (6, 4): 2
Distance from target shape to yellow square at (6, 7): 5
Closest shape is the blue rectangle at (6, 4) with distance 2</think>

<answer>(6, 4)</answer>