Question on rman backups

Dear Experts,

Our database version 12.1.0.2.0,we are not using catalog.3months is backup retention.

Every sunday we have level 0 backup and rest of the days we have level 1 backup.Evry 1 hour,we run archivelog backup.

Can we take archive log backup when rman level 0 backups is running?

Please give us some information on how to identify the backup pieces required to restore the backups.

Ex:

start your full backup at 6pm.

backuping sequence 21,22,23,24

backup datafiles…

at 7 pm one cronjob issue backup archivelog all delete input;

backuping and deleting sequence 21,22,23,24,25,26,27,28,29,30

at 8pm your backup is about to finish

backuping sequence 31

where is my sequence 27 ? and how do i get its name in full backup logs to easily identify