There are 6 shapes on a 5x5 grid. Which shape is closest to the red 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: red right_triangle at (0, 3)
Distance from target shape to orange rectangle at (4, 1): 6
Distance from target shape to green trapezoid at (3, 4): 4
Distance from target shape to gray square at (2, 2): 3
Distance from target shape to brown right_triangle at (1, 4): 2
Distance from target shape to pink rectangle at (1, 0): 4
Closest shape is the brown right_triangle at (1, 4) with distance 2</think>

<answer>(1, 4)</answer>