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 6 7 5 3 5 6 4 4 5 6 4 3 2 5 6 >>> print first 6 >>> print last 6 >>> print 3 5 >>> print 10 6 >>> sqap 4 11 >>> swap 4 11 >>> display 6 7 5 4 5 6 4 4 5 6 3 3 2 5 6 >>> add first 2 >>> add last 3 >>> display 2 6 7 5 4 5 6 4 4 5 6 3 3 2 5 6 3 >>> exit Process finished with exit code 0