class Int32:
    """
    An signed integer with a 32-bit fixed width.
    """

    def __init__(self, value):
        if value < -2 ** 31 or value > 2 ** 31 - 1:
            raise ValueError('value {} cannot be represented in int32'.format(value))
        self._value = value

    def get_value(self):
        return self._value

    def __str__(self):
        return str(self._value)


class Int64:
    """
    An signed integer with a 64-bit fixed width.
    """

    def __init__(self, value):
        if value < -2 ** 63 or value > 2 ** 63 - 1:
            raise ValueError('value {} cannot be represented in int32'.format(value))
        self._value = value

    def get_value(self):
        return self._value

    def __str__(self):
        return str(self._value)


class UInt64:
    """
    An unsigned integer with a 64-bit fixed width.
    """

    def __init__(self, value):
        if value < 0 or value > 2 ** 64 - 1:
            raise ValueError('value {} cannot be represented in uint32'.format(value))
        self._value = value

    def get_value(self):
        return self._value

    def __str__(self):
        return str(self._value)

class Int32:
    """
    A signed integer with a 32-bit fixed width.
    """

    def __init__(self, value):
        if value < -2 ** 31 or value > 2 ** 31 - 1:
            raise ValueError('value {} cannot be represented in int32'.format(value))
        self._value = value

    def get_value(self):
        return self._value

    def __str__(self):
        return str(self._value)


class Int64:
    """
    A signed integer with a 64-bit fixed width.
    """

    def __init__(self, value):
        if value < -2 ** 63 or value > 2 ** 63 - 1:
            raise ValueError('value {} cannot be represented in int32'.format(value))
        self._value = value

    def get_value(self):
        return self._value

    def __str__(self):
        return str(self._value)


class UInt64:
    """
    An unsigned integer with a 64-bit fixed width.
    """

    def __init__(self, value):
        if value < 0 or value > 2 ** 64 - 1:
            raise ValueError('value {} cannot be represented in uint32'.format(value))
        self._value = value

    def get_value(self):
        return self._value

    def __str__(self):
        return str(self._value)

fix English grammar errors in class discription