There are 3 shapes on a 8x8 grid. Which shape is closest to the yellow 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: yellow square at (2, 1)
Distance from target shape to brown rectangle at (7, 4): 8
Distance from target shape to purple trapezoid at (1, 2): 2
Closest shape is the purple trapezoid at (1, 2) with distance 2</think>

<answer>(1, 2)</answer>