There are 6 shapes on a 10x10 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 (5, 1)
Distance from target shape to pink rectangle at (9, 2): 5
Distance from target shape to cyan square at (6, 5): 5
Distance from target shape to green square at (1, 5): 8
Distance from target shape to orange rectangle at (2, 6): 8
Distance from target shape to brown rectangle at (1, 1): 4
Closest shape is the brown rectangle at (1, 1) with distance 4</think>

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