package workplace;

import com.google.common.base.Joiner;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class Main {

    public static void main(String[] args) {
        final int depth = 6;

        final List<Integer> itemsList = new ArrayList<Integer>();
        for (int item=1;item<=depth;item++) {
            itemsList.add(item);
            if (itemsList.size()%2!=0) {
                Collections.sort(itemsList);
            } else {
                Collections.sort(itemsList, Collections.reverseOrder());
            }
            System.out.println(Joiner.on("-").join(itemsList));
        }
    }
}