Resolved: how to extract all digit in nvarchar variable in ms sql

declare @natioanlCode nvarchar(10) = '0083441141';

declare @n1 int = 0;
declare @n2 int = 0;
declare @n3 int = 8;
declare @n4 int = 3;
declare @n5 int = 4;
declare @n6 int = 4;
declare @n7 int = 1;
declare @n8 int = 1;
declare @n9 int = 4;
declare @n10 int = 1;

with test as (
    select N'0083441141' as str 
), rcte as (
    select value = left(str, 1), 
           leftover = right(str, len(str) - 1)
    from test

    union all

    select left(leftover, 1),
           right(leftover, len(leftover) - 1) 
    from rcte
    where len(leftover) > 0
)
select value
from rcte