Sexadecimal/Hexadecimal encode/decode

def decode_sex(sex_value: str) -> str:
    """
    Decode from Sexadecimal to Hexadecimal
    """
    minus = "-"
    if sex_value[0] == minus:
        sex_value = sex_value[1:]
        negative = True
    else:
        negative = False

    digits = "0123456789KSNJFL"
    result = 0
    for index, digit in enumerate(reversed(sex_value)):
        result += digits.index(digit.upper()) * 16 ** index
    if negative:
        result *= -1
    return f"{result:x}"


def encode_sex(hex_value: str) -> str:
    """
    Encode Hexadecimal to Sexadecimal
    """
    minus = "-"

    if hex_value[0] == minus:
        hex_value = hex_value[1:]
        prefix = minus
    else:
        prefix = ""

    result = []
    digits = "0123456789KSNJFL"
    value = int(hex_value, 16)
    rest = 0
    while value:
        result.append(digits[value % 16])
        value //= 16
    return prefix + "".join(reversed(result))