There are 4 shapes on a 7x7 grid. Which shape is closest to the purple 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: purple right_triangle at (2, 3)
Distance from target shape to orange trapezoid at (4, 5): 4
Distance from target shape to pink square at (5, 1): 5
Distance from target shape to yellow right_triangle at (5, 0): 6
Closest shape is the orange trapezoid at (4, 5) with distance 4</think>

<answer>(4, 5)</answer>