removing rows with 5 numbers in a 6 number field

create table SAA_RESP_STRAT_BILL19dec as select * from SAA_RESP_STRAT
--5136 sur 203246 = 198110
select count(1) from SAA_RESP_STRAT
delete from SAA_RESP_STRAT where cfam in
(select distinct cfam from SAA_RESP_STRAT where length(cfam)=6 )
commit
select 203246 - 5136 from dual