There are 6 shapes on a 7x7 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, 5)
Distance from target shape to blue square at (1, 3): 2
Distance from target shape to cyan square at (5, 4): 5
Distance from target shape to orange right_triangle at (6, 5): 5
Distance from target shape to brown right_triangle at (0, 4): 2
Distance from target shape to yellow right_triangle at (0, 1): 5
Closest shape is the blue square at (1, 3) with distance 2</think>

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