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 (1, 3)
Distance from target shape to yellow rectangle at (4, 0): 6
Distance from target shape to green square at (2, 2): 2
Distance from target shape to gray rectangle at (2, 1): 3
Distance from target shape to cyan rectangle at (2, 4): 2
Distance from target shape to pink square at (0, 1): 3
Closest shape is the green square at (2, 2) with distance 2</think>

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