Two rewrite rules don;t cooperate

Two rewrite rules don;t cooperate

I'd like to rewrite two things on one site.
mysite.com/something -> mystie.com/index.php?s=something
and
mysite.com/something/another -> mysite.com/index.php?s=something&d=another
This is my htaccess
RewriteEngine on
RewriteRule ^(.+)$ index.php?s=$1 [L,QSA]
RewriteRule ^(.+)/(.+)$ index.php?s=$1&d=$2 [L,QSA]
Separately both work but together they don't...