There are 5 shapes on a 4x4 grid. Which shape is closest to the green trapezoid in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: green trapezoid at (1, 0)
Distance from target shape to purple square at (1, 3): 3
Distance from target shape to gray rectangle at (1, 1): 1
Distance from target shape to blue square at (0, 0): 1
Distance from target shape to red rectangle at (2, 1): 2
Closest shape is the gray rectangle at (1, 1) with distance 1</think>

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