There are 4 shapes on a 5x5 grid. Which shape is closest to the green 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: green square at (0, 1)
Distance from target shape to gray rectangle at (4, 0): 5
Distance from target shape to cyan right_triangle at (1, 1): 1
Distance from target shape to yellow square at (1, 2): 2
Closest shape is the cyan right_triangle at (1, 1) with distance 1</think>

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