There are 2 shapes on a 6x6 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, 1)
Distance from target shape to cyan rectangle at (5, 3): 7
Closest shape is the cyan rectangle at (5, 3) with distance 7</think>

<answer>(5, 3)</answer>