There are 5 shapes on a 6x6 grid. Which shape is closest to the cyan 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: cyan trapezoid at (3, 3)
Distance from target shape to gray rectangle at (1, 3): 2
Distance from target shape to yellow trapezoid at (4, 0): 4
Distance from target shape to red square at (5, 5): 4
Distance from target shape to purple right_triangle at (3, 1): 2
Closest shape is the gray rectangle at (1, 3) with distance 2</think>

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