Decode or translate with rollup

[baath]

I am trying to get this output:

Writer     Sum
------     -----
John       8
Anne       6
Total:  2  14

I have made the following code which gets the correct figures but I can´t get rid of the rowresults on the second column.

SELECT nvl((a.name),'Total:') AS Writer count(DISTINCT a.name), count(b.isbn) AS Sum
FROM author a, book b
WHERE a.id = b.author_id
GROUP BY ROLLUP(a.name)

I have tried with decode(count(DISTINCT a.name),1,null) and translate(count(DISTINCT a.name),1,null). Then I get blank rows but no summary for the second column.

I also want to have the columnname blank, is that possible?