There are 5 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 (2, 3)
Distance from target shape to green right_triangle at (2, 0): 3
Distance from target shape to yellow right_triangle at (3, 1): 3
Distance from target shape to orange rectangle at (1, 2): 2
Distance from target shape to gray trapezoid at (3, 0): 4
Closest shape is the orange rectangle at (1, 2) with distance 2</think>

<answer>(1, 2)</answer>