There are 5 shapes on a 7x7 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 orange trapezoid at (2, 0): 4
Distance from target shape to brown rectangle at (1, 0): 3
Distance from target shape to red right_triangle at (1, 3): 2
Distance from target shape to cyan right_triangle at (3, 3): 4
Closest shape is the red right_triangle at (1, 3) with distance 2</think>

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