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 (4, 0)
Distance from target shape to gray right_triangle at (1, 5): 8
Distance from target shape to purple right_triangle at (1, 4): 7
Distance from target shape to orange trapezoid at (1, 2): 5
Closest shape is the orange trapezoid at (1, 2) with distance 5</think>

<answer>(1, 2)</answer>