There are 5 shapes on a 8x8 grid. Which shape is closest to the red right_triangle 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 right_triangle at (1, 2)
Distance from target shape to purple right_triangle at (6, 1): 6
Distance from target shape to pink rectangle at (5, 2): 4
Distance from target shape to yellow rectangle at (1, 0): 2
Distance from target shape to brown square at (5, 3): 5
Closest shape is the yellow rectangle at (1, 0) with distance 2</think>

<answer>(1, 0)</answer>