There are 5 shapes on a 5x5 grid. Which shape is closest to the blue 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: blue right_triangle at (1, 4)
Distance from target shape to gray trapezoid at (4, 0): 7
Distance from target shape to cyan right_triangle at (0, 3): 2
Distance from target shape to yellow square at (4, 2): 5
Distance from target shape to purple right_triangle at (2, 2): 3
Closest shape is the cyan right_triangle at (0, 3) with distance 2</think>

<answer>(0, 3)</answer>