def multiplication(x, y):
    """
    Multiplication x and y

    >>> multiplication('25', 10)
    Traceback (most recent call last):
    ...
    AssertionError: The x value must be an int or float

     >>> multiplication(5, 10)
     50
    """
    assert isinstance(x, (int, float)), "The x value must be an int or float"
    assert isinstance(y, (int, float)), "The y value must be an int or float"
    return x * y