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.Scanner;

public class Task244A {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int k = sc.nextInt();
		int[] a = new int[k];
		for (int i = 0; i < k; i++) {
			a[i] = sc.nextInt();
		}
		sc.close();
		
		int[] dol = new int[n * k];
		for (int i = 0; i < n * k; i++) {
			boolean flag = true;
			for (int j = 0; j < k; j++) {
				if (i + 1 == a[j]) {
					flag = false;
					break;
				}
			}
			if (flag) {
				dol[i] = i + 1;
			} else {
				dol[i] = 0;
			}
		}
		
		int[][] ank = new int[k][n];
		int it = 0;
		for (int i = 0; i < k; i++) {
			ank[i][0] = a[i];
			for (int j = 1; j < n; j++) {
				boolean flag = true;
				do {
					if (dol[it] != 0) {
						ank[i][j] = dol[it];
						flag = false;
					}
					it++;
				} while (flag);
			}
		}
		
		for (int i = 0; i < k; i++) {
			for (int j = 0; j < n; j++) {
				System.out.print(ank[i][j] + " ");
			}
			System.out.println();
		}
	}
}