There are 3 shapes on a 8x8 grid. Which shape is closest to the brown 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: brown trapezoid at (5, 7)
Distance from target shape to gray right_triangle at (1, 3): 8
Distance from target shape to red square at (2, 2): 8
Closest shape is the gray right_triangle at (1, 3) with distance 8</think>

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