The following text was written to the standard output stream when the ? program was executed from Netbeans.
>>>display 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >>>print first 1 >>>print last 15 >>>swap 1 15 >>>display 15 2 3 4 5 6 7 8 9 10 11 12 13 14 1 >>>help HELP - display 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 >>>exit Process finished with exit code 0