def do$\_$wh$\_$parser$($lexer$)$:#production rule $15$

Printer.print$\_$message$("$

Enter $")$

#Your code comes here:...

Printer.print$\_$message$("$

Exit $")$

return

def sw$\_$cs$\_$parser$($lexer$)$:#production rule $16$

Printer.print$\_$message$("$

Enter $")$

#Your code comes here:...

Printer.print$\_$message$("$

Exit $")$

return