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.util.*;

public class File {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt(), k = sc.nextInt();
        boolean[] given = new boolean[n * k + 1];
        int[] arr = new int[k];
        for (int i = 0; i < k; i++) {
            arr[i] = sc.nextInt();
            given[arr[i]] = true;
        }
        int ind = 1;
        for (int ai : arr)
            ind = printSeg(ai, n, ind, given);

        sc.close();
    }

    public static int printSeg(int ai, int n, int ind, boolean[] given) {
        System.out.print(ai + " ");
        int counter = n - 1;
        while (counter > 0) {
            if (given[ind] == false) {
                System.out.print(ind + " ");
                given[ind] = true;
                counter--;
            }
            ind++;
        }
        System.out.println();
        return ind;
    }

}