The following text was written to the standard output stream when the ? program was executed from IntelliJ.
>>>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 >>>display 15 14 10 9 13 12 8 7 11 6 5 4 3 2 1 >>>print first 15 >>>print last 1 >>>print 3 10 >>>print 12 4 >>>swap 5 7 >>>display 15 14 10 9 8 12 13 7 11 6 5 4 3 2 1 >>>swap 1 15 >>>display 1 14 10 9 8 12 13 7 11 6 5 4 3 2 15 >>>add first 200 >>>add last 100 >>>shownumbers ### Unrecognizable command: shownumbers >>>display 200 1 14 10 9 8 12 13 7 11 6 5 4 3 2 15 100 >>>exit Process finished with exit code 0