If a seat is not available then the ticket is given a waitlist number; otherwise the ticket is confirmed and a berth number is printed on the ticket. A person receiving a wait-listed ticket may be able to obtain a confirmed ticket if there are sufficient cancellations. Some of the tickets are assigned to the Reservation against Cancellation (RAC), which is between the waiting list and the confirmed list. These allow the ticket holder to board the train and obtain an allotted seat decided by a ticket collector, after the ticket collector has ascertained that a seat is vacant.