If number of alphabets in the column is fixed then you can use this query
select max(substring(columnname,2(no.of alphabets+1),len(columnname)-1)) from tablename
with this query you will get max integer that means 13
and in code while inserting into database you can attach that fixed alphabet to the column and then insert.
I hope you understood what i am saying.
if i am not clear feel free to ask.