There are 5 shapes on a 7x7 grid. Which shape is closest to the pink square in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: pink square at (1, 6)
Distance from target shape to brown rectangle at (1, 3): 3
Distance from target shape to red right_triangle at (0, 2): 5
Distance from target shape to gray right_triangle at (2, 1): 6
Distance from target shape to purple trapezoid at (5, 3): 7
Closest shape is the brown rectangle at (1, 3) with distance 3</think>

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