Section 10,25: Q

 (Query Remaining Character Count)

 On input, Q obtains the number of characters remaining in the input
 record to be transferred during a read operation.  The following
 example uses the Q descriptor to determine the size of the input
 record:

    READ(5,'(Q,A)') LEN, REC(1:LEN)

 On output, the Q descriptor has no effect, except that the
 corresponding I/O item is skipped.