There are 6 shapes on a 7x7 grid. Which shape is closest to the red 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: red square at (1, 6)
Distance from target shape to purple rectangle at (6, 3): 8
Distance from target shape to yellow right_triangle at (2, 2): 5
Distance from target shape to blue square at (0, 0): 7
Distance from target shape to pink rectangle at (1, 1): 5
Distance from target shape to orange right_triangle at (6, 2): 9
Closest shape is the yellow right_triangle at (2, 2) with distance 5</think>

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