RMAN Oracle Streams

Hi,

I have the following warning in the stream Health Report:

WARNING: There are 1210 archived logs ready to be purged from disk.
+ Use the following select to identify unneeded logfiles:
+ select name from dba_registered_archived_log where purgeable = "YES"
PL/SQL procedure successfully completed.

I am using RMAN for backing my database.

Script:

---------------

backup database plus archivelog;
backup archivelog all not backed up delete all input;

crosscheck backup;
delete obsolete;

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The archive logs is growing continuously.

How I could remove those unneeded archive logs?

Thanks.