There are 5 shapes on a 3x3 grid. Which shape is closest to the red square 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 square at (1, 0)
Distance from target shape to green square at (2, 1): 2
Distance from target shape to gray trapezoid at (2, 2): 3
Distance from target shape to purple trapezoid at (1, 1): 1
Distance from target shape to orange right_triangle at (0, 1): 2
Closest shape is the purple trapezoid at (1, 1) with distance 1</think>

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