import java.util.*;

public class Main {
    public static void main(String[] args) {
        List<String> strs = Arrays.asList("d", "a", "y / a", "a / z", "b / a / c", "a / c / a");

        Comparator<String> slashComparator = Comparator.comparing(
                s -> s.length() - s.replace("/", "").length()
        );

        strs.stream()
                .sorted(slashComparator.thenComparing(Comparator.naturalOrder()))
                .forEach(System.out::println);
    }
}