There are 6 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 (6, 1)
Distance from target shape to brown right_triangle at (3, 1): 3
Distance from target shape to pink square at (2, 6): 9
Distance from target shape to green square at (2, 1): 4
Distance from target shape to purple right_triangle at (6, 6): 5
Distance from target shape to yellow right_triangle at (0, 1): 6
Closest shape is the brown right_triangle at (3, 1) with distance 3</think>

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