How to get only the record which is different by outer join

Hi,
how to get the values Existing in table A which are not existing in table B by using left outer join, In this example only the record '3' should display. thanks
the requirementment is like
Table A.Number Table B.Number
1 1
2 2
3 4
4 5
output
3

SQL> with a as (
select 1 a from dual union all
select 2 a from dual union all
select 3 a from dual union all
select 4 a from dual
b as (
select 1 a from dual union all
select 2 a from dual union all
select 4 a from dual union all
select 5 a from dual
select a.*
from a left outer join b on (a.a = b.a)
where b.a is null
A
3

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