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

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