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 10 12 11 4 7 5 9 56 2 3 8 5 >>> print first 10 >>> print last 5 >>> print 3 11 >>> print 10 3 >>> swap 8 9 >>> display 10 12 11 4 7 5 9 2 56 3 8 5 >>> swap 10 5 >>> display 10 12 11 4 3 5 9 2 56 7 8 5 >>> swap 1 18 >>> display 0 12 11 4 3 5 9 2 56 7 8 5 >>> 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 >>> add first 100 >>> add last 200 >>> shownumbers ### Unrecognizable command: shownumbers >>> display 100 0 12 11 4 3 5 9 2 56 7 8 5 200 >>> exit