How to subtract the value from previous value

I have a table like this:

I need to subtract INT column from PRIN and get the subtracted amount in first row.
On second and following rows I need to also subtract INT values from all preceding rows.

The result should look like this:

I have tried using LEAD and LAG functionality but cannot get subtraction correctly and this should be done in SQL.

Here is the script:

create table tbl9 ( dt date, prin varchar2(20), int varchar2(20));
insert into tbl9 values(to_date('01-01-2023','dd-mm-yyyy'),100000, 1100);
insert into tbl9 values(to_date('01-02-2023','dd-mm-yyyy'),100000, 1200);
insert into tbl9 values(to_date('01-03-2023','dd-mm-yyyy'),100000, 1500);
insert into tbl9 values(to_date('01-04-2023','dd-mm-yyyy'),100000, 2300);
commit;

You can use a Window Function SUM() for that

SELECT dt,prin, int, prin - SUM(int) OVER(PARTITION BY prin ORDER BY dt) bal
FROM tbl9

fiddle