from typing import Tuple


def next_fib(prev_res: Tuple[int, int], _) -> Tuple[int, int]:
    """
    Produces next pair of Fibonacci numbers

    :param prev_res: previous pair of Fibonacci numbers (F[N-1], F[N])
    :param _: ignored
    :return: next pair of Fibonacci numbers (F[N], F[N+1])
    """
    return prev_res[-1], prev_res[-1] + prev_res[-2]