There are 4 shapes on a 7x7 grid. Which shape is closest to the brown 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: brown square at (1, 1)
Distance from target shape to green right_triangle at (1, 6): 5
Distance from target shape to yellow square at (0, 0): 2
Distance from target shape to pink right_triangle at (5, 2): 5
Closest shape is the yellow square at (0, 0) with distance 2</think>

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