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Lateral Surface Area of a Cube

Write a Python function to calculate the lateral surface area of a cube given its side length. The lateral surface area of a cube is the sum of the areas of its four vertical faces. If the side length of the cube is `l`, the lateral surface area can be calculated as:

\[ LSA = 4 \times (l^2) \]

#### Example Usage
```python [main.nopy]
print(lateral_surface_area(5))  # Output: 100
print(lateral_surface_area(9))  # Output: 324
print(lateral_surface_area(10)) # Output: 400
```
def lateral_surface_area(l: float) -> float:
    """
    Calculate the lateral surface area of a cube given its side length.

    Args:
        l (float): The side length of the cube.

    Returns:
        float: The lateral surface area of the cube.
    """
    # Replace the following line with the correct implementation
    pass
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