SQL> select object_name, object_type from dba_objects where object_name||object_type in (select object_name||object_type from dba_objects where owner = 'SYS') and owner='SYSTEM';
SQL> select 'DROP ' || object_type || ' SYSTEM.' || object_name || ';' "Generate Drop Scrips" from dba_objects where object_name||object_type in (select object_name||object_type from dba_objects where owner = 'SYS') and owner = 'SYSTEM';