The following text was written to the standard output stream when the ? program was executed from IntelliJ.
>>> display who what where when how because why explain reason arugment >>> print first who >>> print last arugment >>> help HELP - display a menu of commands DISPLAY - display the list of words PRINT - print a number (FIRST; LAST; nth) SWAP - exchange two elements (nth;mth) ADD - add a number to the list (FIRST;LAST EXIT - terminate the execution of the program >>> Process finished with exit code 130