There are 5 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, 3)
Distance from target shape to red rectangle at (2, 0): 5
Distance from target shape to green trapezoid at (0, 2): 1
Distance from target shape to cyan right_triangle at (2, 1): 4
Distance from target shape to yellow rectangle at (3, 3): 3
Closest shape is the green trapezoid at (0, 2) with distance 1</think>

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