There are 3 shapes on a 6x6 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 (1, 5)
Distance from target shape to yellow right_triangle at (0, 1): 5
Distance from target shape to gray right_triangle at (5, 3): 6
Closest shape is the yellow right_triangle at (0, 1) with distance 5</think>

<answer>(0, 1)</answer>