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

<answer>(0, 3)</answer>