nX (Skip Right n Positions)

  The X field descriptor functions the same as the TR field
  descriptor.

  On input, X starts the next read operation after skipping "n"
  character positions.  If X is the last format item, it will have no
  effect.

  On output, X starts the next write operation after skipping the "n"
  character positions.  Intervening characters are not written over.
  If X is the last format code executed, it will have no effect.

  The position specified must be in integer in the range 1 through
  the size of the record.