def sum_number(a: int, b: int) -> int | None:
    if isinstance(a, int) and isinstance(b, int):
        result: int = a + b
        return result


one_sum: int | None = sum_number(a=5, b=10)
two_sum: int | None = sum_number(a=35, b=1)
three_sum: int | None = sum_number(a=15, b="15")

print(
    "Результат: one_sum: {}\nРезультат: two_sum: {}\nРезультат: three_sum: {}".format(
        one_sum, two_sum, three_sum
    )
)


def hello_message() -> None:
    print("Привет пользователь!")


hello_message()