rambless

import java.util.*;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {

    static List<String> list = new ArrayList<>();

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextInt()) { // 注意 while 处理多个 case
            list.clear();
            int n = in.nextInt();
            int[] arr = new int[n];
            for(int i=0; i<n; i++) {
                arr[i] = in.nextInt();
            }
            Deque<Integer> stack = new LinkedList<>();
            out(arr, stack, 0, 0, "");
            Collections.sort(list);
            for(String s : list) {
                System.out.println(s);
            }
        }
    }
    
    private static void out(int[] arr, Deque<Integer> stack, int i, int n, String str) {
        if(n==arr.length) {
            list.add(str);
        }
        if(!stack.isEmpty()) {
            int pop = stack.pop();
            out(arr, stack, i, n+1, str+pop+" ");
            stack.push(pop);
        }
        if(i<arr.length) {
            stack.push(arr[i]);
            out(arr, stack, i+1, n, str);
            stack.pop();
        }
    }
}