Problem: Vitaly has an array of n distinct integers. Vitaly wants to divide this array into three non-empty sets so as the following conditions hold: 

  1. The product of all numbers in the first set is less than zero ( < 0). 
  2. The product of all numbers in the second set is greater than zero ( > 0). 
  3. The product of all numbers in the third set is equal to zero. 
  4. Each number from the initial array must occur in exactly one set. 



Help Vitaly. Divide the given array.

Input

The first line of the input contains integer n (3 ≤ n ≤ 100). The second line contains n space-separated distinct integers a1, a2, ..., an (|ai| ≤ 103) — the array elements.

Output

In the first line print integer n1 (n1 > 0) — the number of elements in the first set. Then print n1 numbers — the elements that got to the first set.

In the next line print integer n2 (n2 > 0) — the number of elements in the second set. Then print n2 numbers — the elements that got to the second set.

In the next line print integer n3 (n3 > 0) — the number of elements in the third set. Then print n3 numbers — the elements that got to the third set.

The printed sets must meet the described conditions. It is guaranteed that the solution exists. If there are several solutions, you are allowed to print any of them.

Examples

Input

3
-1 2 0


Output

1 -1
1 2
1 0


Input

4
-1 -2 -3 0


Output

1 -1
2 -3 -2
1 0

Solution (in JAVA):

Solution:

//package Round_181;

import java.util.*;
import java.io.*;
import static java.lang.Math.*;

public class A {
            
            void solve () throws IOException {
                        int n = in.nextInt();
                        int a[] = in.readIntArray(n);
                        ArrayList<Integer> a1 = new ArrayList<Integer>();
                        ArrayList<Integer> a2 = new ArrayList<Integer>();
                        ArrayList<Integer> a3 = new ArrayList<Integer>();
                        boolean u[] = new boolean[n];
                        boolean f = false;
                        for (int i = 0; i<n; i++){
                                    if (a[i] > 0){
                                                f = true;
                                                u[i] = true;
                                                a2.add(a[i]);
                                                break;
                                    }
                        }
                        
                        for (int i = 0; i<n; i++){
                                    if (!u[i] && a[i] < 0){
                                                a1.add(a[i]);
                                                f = false;
                                                u[i] = true;
                                                break;
                                    }
                        }
                        
                        for (int i = 0; i<n && a2.size() == 0; i++){
                                    for (int j = 0; j<n; j++)
                                                if (i != j && !u[i] && !u[j] && a[i] * a[j] > 0){
                                                            a2.add(a[i]);
                                                            u[i] = u[j] = true;
                                                            f = true;
                                                            a2.add(a[j]);
                                                            break;
                                                }
                        }
                        
                        
                        
                        for (int i = 0; i<n && a1.size() == 0; i++){
                                    for (int j = 0; j<n; j++)
                                                if (i != j && !u[i] && !u[j] && a[i] < 0){
                                                            a1.add(a[i]);
                                                            u[i] = u[j] = true;
                                                            f = false;
                                                            a1.add(a[j]);
                                                            break;
                                                }
                        }
                        
                        for (int i = 0; i<n; i++){
                                    if (!u[i]){
                                                a3.add(a[i]);
                                    }
                        }
                        
                        out.print(a1.size() + " ");
                        for (int x : a1)
                                    out.print(x + " ");
                        out.println();
                        out.print(a2.size() + " ");
                        for (int x : a2)
                                    out.print(x + " ");
                        out.println();
                        out.print(a3.size() + " ");
                        for (int x : a3)
                                    out.print(x + " ");
                        out.println();
            }
            
            String input = "";
            String output = "";
            FastScanner in;
            PrintWriter out;
            
            void run () {
                        try {
                                    BufferedReader bf;
                                    if (input.length() == 0) {
                                                bf = new BufferedReader(new InputStreamReader(System.in));
                                    } else {
                                                bf = new BufferedReader(new FileReader(input));
                                    }
                                    in = new FastScanner(bf);
                                    
                                    if (output.length() == 0) {
                                                out = new PrintWriter(System.out);
                                    } else {
                                                out = new PrintWriter(new File(output));
                                    }
                                    
                                    solve();
                                    
                                    out.close();
                        } catch (Exception ex) {
                                    out.close();
                                    ex.printStackTrace();
                        }
            }
            
            public static void main (String[] args) {
                        new A().run();
            }
            
            class FastScanner {

                        BufferedReader bf;
                        StringTokenizer st;
                        
                        FastScanner (BufferedReader bf) {
                                    this.bf = bf;
                        }
                        
                        String next () throws IOException {
                                    while (st == null || !st.hasMoreTokens()) {
                                                st = new StringTokenizer(bf.readLine());
                                    }
                                    return st.nextToken();
                        }
                        
                        String nextLine () throws IOException {
                                    String line = bf.readLine();
                                    while (line.length() == 0) {
                                                line = bf.readLine();
                                    }
                                    return line;
                        }
                        
                        int nextInt () throws IOException {
                                    return Integer.parseInt(next());
                        }
                        
                        long nextLong () throws IOException {
                                    return Long.parseLong(next());
                        }
                        
                        double nextDouble () throws IOException {
                                    return Double.parseDouble(next());
                        }
                        
                        int[] readIntArray (int n) throws IOException {
                                    int[] a = new int[n];
                                    for (int i = 0; i < n; i++) {
                                                a[i] = in.nextInt();
                                    }
                                    return a;
                        }
                        
                        long[] readLongArray (int n) throws IOException {
                                    long[] a = new long[n];
                                    for (int i = 0; i < n; i++) {
                                                a[i] = nextLong();
                                    }
                                    return a;
                        }
            }
}