Problem: One day Ms Swan bought an orange in a shop. The orange consisted of n·k segments, numbered with integers from 1 to n·k. 

There were k children waiting for Ms Swan at home. The children have recently learned about the orange and they decided to divide it between them. For that each child took a piece of paper and wrote the number of the segment that he would like to get: the i-th (1 ≤ i ≤ k) child wrote the number ai (1 ≤ ai ≤ n·k). All numbers ai accidentally turned out to be different.

Now the children wonder, how to divide the orange so as to meet these conditions:

  * each child gets exactly n orange segments; 
  * the i-th child gets the segment with number ai for sure; 
  * no segment goes to two children simultaneously. 



Help the children, divide the orange and fulfill the requirements, described above.

Input

The first line contains two integers n, k (1 ≤ n, k ≤ 30). The second line contains k space-separated integers a1, a2, ..., ak (1 ≤ ai ≤ n·k), where ai is the number of the orange segment that the i-th child would like to get.

It is guaranteed that all numbers ai are distinct.

Output

Print exactly n·k distinct integers. The first n integers represent the indexes of the segments the first child will get, the second n integers represent the indexes of the segments the second child will get, and so on. Separate the printed numbers with whitespaces.

You can print a child's segment indexes in any order. It is guaranteed that the answer always exists. If there are multiple correct answers, print any of them.

Examples

Input

2 2
4 1


Output

2 4 
1 3 


Input

3 1
2


Output

3 2 1 

Solution (in JAVA):

Solution:
import java.io.PrintWriter;
import java.util.*;

/**
 * Created with IntelliJ IDEA.
 * User: Asus
 * Date: 16.11.12
 * Time: 19:09
 * To change this template use File | Settings | File Templates.
 */
public class TaskC {
    static Scanner sc;
    static PrintWriter pw;
    public static void main (String[] ArgS) {
        sc = new Scanner(System.in);
        pw = new PrintWriter(System.out);
        int n = sc.nextInt();
        int k = sc.nextInt();
        List<Integer> a = new ArrayList<Integer>();
        int[] b = new int[k];
        for (int i = 0; i < k; i++) {
            b[i] = sc.nextInt();
        }

        for(int i = 0; i < n*k; i++) {
            a.add(i+ 1);
        }

        for (int i = 0; i < k; i++) {
            a.remove(a.indexOf(b[i]));
        }

        for (int i = 0; i < k; i++) {
            pw.print(b[i] + " ");
            for (int j = 0; j < n - 1; j++) {
                int t = a.get(0);
                pw.print(t + " ");
                a.remove(0);
            }
            pw.println();
        }

        sc.close();
        pw.close();
    }
}