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

<answer>(4, 0)</answer>