There are 6 shapes on a 7x7 grid. Which shape is closest to the yellow 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: yellow right_triangle at (6, 2)
Distance from target shape to green rectangle at (0, 1): 7
Distance from target shape to orange square at (1, 4): 7
Distance from target shape to brown right_triangle at (5, 1): 2
Distance from target shape to red right_triangle at (0, 5): 9
Distance from target shape to blue trapezoid at (4, 0): 4
Closest shape is the brown right_triangle at (5, 1) with distance 2</think>

<answer>(5, 1)</answer>