public class Sapa {
    static final String VERSI = "1.0";

    public static void main(String[] args) {
        if (args.length == 1 && args[0].equals("--versi")) {
            System.out.println("sapa " + VERSI);
            return;
        }
        if (args.length != 1) {
            System.err.println("Pemakaian: sapa NAMA | sapa --versi");
            System.exit(2);
        }
        System.out.println("Halo, " + args[0] + "!");
    }
}