The following text was written to the standard output stream when the NumberList 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 >>> add first 1 >>> add last 10 >>> print first 1 >>> swap 1 17 >>> display 10 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 1 >>> exit