class Bits:
    def __init__(self, value, encoding='ascii', length=None):
        if isinstance(value, str):
            self.int = ord(value)
        elif isinstance(value, int):
            self.int = value % 128   # ⚠️ change to 128 (ASCII range)
        else:
            raise TypeError("Unsupported type")

    @property
    def ascii(self):
        return chr(self.int)

    def __add__(self, other):
        return Bits((self.int + other.int) % 128)

    def __sub__(self, other):
        return Bits((self.int - other.int) % 128)

    def __repr__(self):
        return f"Bits({self.int})"