def validate_input(start, end):
    """Convert start and end strings to ints.

    Args:
        start: starting value
        end: ending value

    Returns:
        start, end as ints
    """
    try:
        start = int(start)
    except ValueError:
        start = 0

    try:
        end = int(end)
    except ValueError:
        end = 9999999

    return (start, end)