There are 2 shapes on a 6x6 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 (2, 5)
Distance from target shape to pink right_triangle at (5, 1): 7
Closest shape is the pink right_triangle at (5, 1) with distance 7</think>

<answer>(5, 1)</answer>