There are 6 shapes on a 7x7 grid. Which shape is closest to the brown 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: brown right_triangle at (6, 3)
Distance from target shape to orange rectangle at (3, 3): 3
Distance from target shape to purple rectangle at (3, 6): 6
Distance from target shape to pink trapezoid at (1, 1): 7
Distance from target shape to cyan right_triangle at (6, 1): 2
Distance from target shape to blue square at (1, 6): 8
Closest shape is the cyan right_triangle at (6, 1) with distance 2</think>

<answer>(6, 1)</answer>