public class Main {

    public static void main(String[] args) {

        SimpleCollection s = new SimpleCollection("alphabet");
        System.out.println(s);

        System.out.println();

        s.add("a");
        System.out.println(s);

        System.out.println();

        s.add("b");
        System.out.println(s);

        System.out.println();

        s.add("c");
        System.out.println(s);

    }
}