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

<answer>(1, 3)</answer>