The following text was written to the standard output stream when the ? program was executed from IntelliJ.
>>> help HELP - display a menu of commands DISPLAY - display the list of numbers PRINT - print a number (FIRST;LAST;nth) SWAP - exchange two elements (nth;mth) ADD - add a number to the list (FIRST;LAST) EXIT - terminate execution of the program >>> display There Once Was A Dog Who Liked To Eat >>> print first There >>> print last Eat >>> print 3 Was >>> print 6 Who >>> swap 2 4 >>> display There A Was Once Dog Who Liked To Eat >>> swap 4 5 >>> display There A Was Dog Once Who Liked To Eat >>> add first the >>> add last he >>> displayy ### Unrecognizable command: displayy >>> display the There A Was Dog Once Who Liked To Eat he >>> exit