There are 5 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 (4, 0)
Distance from target shape to orange right_triangle at (1, 4): 7
Distance from target shape to blue right_triangle at (1, 0): 3
Distance from target shape to cyan trapezoid at (3, 5): 6
Distance from target shape to yellow right_triangle at (4, 5): 5
Closest shape is the blue right_triangle at (1, 0) with distance 3</think>

<answer>(1, 0)</answer>