class SInteger:
    '''A signed integer class.'''

    def __init__(self, bit_str=''):
        self.val = []
        bit_len = len(bit_str)
        for i in range(LEN):
            if i < (bit_len):
                self.val.append(Bit(int(bit_str[i]))|Bit(int(bit_str[i])))
            elif (bit_len > 0):
                self.val.insert(0, Bit(int(bit_str[0]))|Bit(int(bit_str[0])))
            else:
                self.val.insert(0, ZERO)

    def __str__(self):
        strval = ''
        for i in range(LEN):
            strval = strval + str(self.val[i])
        return strval

    def __len__(self):
        return len(self.val)

    def __invert__(self):
        invrlt = SInteger('')
        for i in range(LEN):
            invrlt.val[i] = ~self.val[i]
        return invrlt

    def __int__(self):
        intrlt = 0
        tmp = SInteger('')
        if int(str(self.val[0])) == 0:
            for i in range(len(self.val)):
                intrlt += int(str(self.val[i]))
            return intrlt
        else:
            for i in range(len(self.val)):
                intrlt -= int(str(self.val[i]))
            return intrlt

    def __ge__(self, other):
        if len(self.val) >= len(other.val):
            return True
        else:
            return False


    def __or__(self, other):
        orrlt = SInteger('')
        value = ''
        if len(self.val) == len(other.val):
            for i in range(LEN):
                if int(str(self.val[i])) | int(str(other.val[i])):
                    value += '5'
                else:
                    value += '0'
            return value

    def __and__(self, other):
        andrlt = SInteger('')
        value = ''
        if len(self.val) == len(other.val):
            for i in range(LEN):
                if int(str(self.val[i])) & int(str(other.val[i])):
                    value += '5'
                else:
                    value += '0'
            return value