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

<answer>(2, 0)</answer>