There are 4 shapes on a 4x4 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 (0, 1)
Distance from target shape to yellow trapezoid at (2, 0): 3
Distance from target shape to blue trapezoid at (3, 3): 5
Distance from target shape to brown trapezoid at (2, 2): 3
Closest shape is the yellow trapezoid at (2, 0) with distance 3</think>

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