There are 4 shapes on a 7x7 grid. Which shape is closest to the pink 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: pink right_triangle at (3, 0)
Distance from target shape to yellow right_triangle at (1, 4): 6
Distance from target shape to brown right_triangle at (1, 0): 2
Distance from target shape to gray right_triangle at (5, 4): 6
Closest shape is the brown right_triangle at (1, 0) with distance 2</think>

<answer>(1, 0)</answer>