Using operator add to add a string

Hi.
I have data in string
data length
001 3
009 3
010 3
0001 4
0012 4
00009 5
i need to add for example 001+005.
i use this query
select to_char((to_char('009') + to_char('001')),'099') from dual
but it return : 010
my problem is the length is not same. if i hard coded '099', i cannot use same query for length 4 and 5.
Please advice.
Message was edited by:
user22282

I don't understand either, something like this?
INFO/INFO_PROD> select a,b,lpad(a,b,'0') chara
2 from (select 1 a,3 b from dual union
3        select 9,3 from dual union
4        select 8,5 from dual union
5        select 10,6 from dual
6        )
7        ;
         A          B CHARA
         1          3 001
         8          5 00008
         9          3 009
        10          6 000010regards, martina

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