class cutter:
    def __init__(self, target: bytes) -> None:
        self.__current = target

    def __check(self, count: int) -> None:
        if count == 0:
            raise RuntimeError("Cutter is already empty.")

        if count > self.size:
            raise RuntimeError("Count is higher than size.")
        
    def from_start(self, count: int) -> bytes:
        self.__check(count)

        result = self.__current[:count]
        self.__current = self.__current[count:]

        return result

    def from_end(self, count: int) -> bytes:
        self.__check(count)

        result = self.__current[self.size - count:]
        self.__current = self.__current[:self.size - count]

        return result

    def cut(self, count: int) -> bytes:
        return self.from_end(count)

    def trim(self, count: int) -> bytes:
        return self.from_start(count)

    @property
    def content(self) -> bytes:
        return self.__current

    @property
    def size(self) -> int:  
        return len(self.__current)

    def __len__(self) -> int:
        return self.size