There are 5 shapes on a 5x5 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, 1)
Distance from target shape to red square at (3, 0): 2
Distance from target shape to cyan rectangle at (3, 1): 1
Distance from target shape to orange rectangle at (1, 0): 4
Distance from target shape to pink trapezoid at (0, 1): 4
Closest shape is the cyan rectangle at (3, 1) with distance 1</think>

<answer>(3, 1)</answer>