Oracle account Scott is locked out how to unlock

The following steps are as follows: C:> sqlplus Please enter your username: sys input password: SYS as SYSDBA//NOTE: The password entered here must follow the as SYSDBA.      sql> alter user Scott account unlock; The user has changed.      Sql> commit; Submit complete. Sql> Conn Scott/tiger change Scott password new password: Tiger Retype the new password: Tiger password changed connected. Scott default password Tigersystem account default password: 1, please enter the user name: sys input password: SYS as SYSDBA//NOTE: Enter the password here 2, Sql>alter user system identified by manager;//prompt system is locked 3, Sql>alter User System account Unlock;4, Sql>commit;5, Sql>conn System/manager

Oracle account Scott is locked out how to unlock