SQL Developer Last four of the Social Security

I am using Oracle SQL Developer and I am trying to produce a report that will only give me the last four of the social security number.  The normal format is XXX-XX-XXXX , but I will only like the last four.
I tried
Select right(table.SS, 4 from table where.........        but this doesn't work.


Select Right(table.SS, -4) from table where.....
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slightwv (䄆 Netminder) Commented:
If you always want the last 4 no matter what:
select substr('123-45-6789',-4) from dual;

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