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

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