There are 4 shapes on a 6x6 grid. Which shape is closest to the brown 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: brown right_triangle at (5, 3)
Distance from target shape to red trapezoid at (3, 1): 4
Distance from target shape to orange trapezoid at (1, 5): 6
Distance from target shape to cyan rectangle at (4, 4): 2
Closest shape is the cyan rectangle at (4, 4) with distance 2</think>

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