There are 5 shapes on a 9x9 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 (1, 4)
Distance from target shape to yellow right_triangle at (2, 4): 1
Distance from target shape to pink square at (7, 3): 7
Distance from target shape to orange right_triangle at (1, 8): 4
Distance from target shape to red trapezoid at (1, 7): 3
Closest shape is the yellow right_triangle at (2, 4) with distance 1</think>

<answer>(2, 4)</answer>