Of the following numbers which is an integer but does not belong in either of the subsets of integer -13 or 0 or 13

Of the following numbers, -1 and 1 are integers that do not belong in either of the subsets {-13, 0, 13}.

An integer that does not belong in either of the subsets of -13, 0, or 13 is any integer that lies between -12 and -1 or between 1 and 12. These integers are not part of the sets mentioned earlier.