There are 6 shapes on a 4x4 grid. Which shape is closest to the red rectangle 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 rectangle at (1, 1)
Distance from target shape to gray right_triangle at (1, 2): 1
Distance from target shape to orange square at (0, 3): 3
Distance from target shape to yellow trapezoid at (0, 0): 2
Distance from target shape to cyan square at (1, 3): 2
Distance from target shape to green right_triangle at (0, 2): 2
Closest shape is the gray right_triangle at (1, 2) with distance 1</think>

<answer>(1, 2)</answer>