There are 5 shapes on a 4x4 grid. Which shape is closest to the blue 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: blue trapezoid at (0, 2)
Distance from target shape to pink rectangle at (3, 2): 3
Distance from target shape to cyan rectangle at (1, 3): 2
Distance from target shape to yellow rectangle at (0, 0): 2
Distance from target shape to brown right_triangle at (3, 1): 4
Closest shape is the cyan rectangle at (1, 3) with distance 2</think>

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