def METHOD_NAME(num):
    num = int(abs(num))
    def nbase(num, numerals="abcdefghijklmnopqrstuvwxyz0123456789"):
        return ((num == 0) and numerals[0]) or (nbase(num // len(numerals), numerals).lstrip(numerals[0]) + numerals[num % len(numerals)])
    return nbase(num)