There are 6 shapes on a 5x5 grid. Which shape is closest to the gray 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: gray square at (2, 1)
Distance from target shape to green trapezoid at (3, 3): 3
Distance from target shape to cyan square at (0, 4): 5
Distance from target shape to blue right_triangle at (1, 1): 1
Distance from target shape to yellow right_triangle at (0, 3): 4
Distance from target shape to brown rectangle at (1, 2): 2
Closest shape is the blue right_triangle at (1, 1) with distance 1</think>

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