The SET PROMPT statement enables a question mark prompt to appear  after
  BASIC  executes  an  INPUT, LINPUT, INPUT LINE or MAT INPUT statement on
  channel zero -  this  is  the  default  behavior.   The  SET  NO  PROMPT
  statement disables the question mark prompt.

  Note that the SET PROMPT statement is  *not*  synonymous  with  the  SET
  command and therefore cannot be used in immediate mode.

  Example

  DECLARE STRING your_name, your_age, your_grade
  INPUT "Enter your name";your_name
  SET NO PROMPT
  INPUT "Enter your age";your_age
  SET PROMPT
  INPUT "Enter the last school grade you completed";your_grade