There are 5 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 (3, 3)
Distance from target shape to yellow trapezoid at (4, 0): 4
Distance from target shape to red trapezoid at (1, 3): 2
Distance from target shape to cyan square at (2, 0): 4
Distance from target shape to blue right_triangle at (0, 1): 5
Closest shape is the red trapezoid at (1, 3) with distance 2</think>

<answer>(1, 3)</answer>