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

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