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

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