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 Solution {

	public void solve(){
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int k = sc.nextInt();
		
		int[] oranges = new int[n*k];
		
		for(int i = 0; i < oranges.length; i++){
			oranges[i] = -1;
		}
		
		for(int i = 0; i < k; i++){
			int index = sc.nextInt();
			oranges[index-1] = i;
		}
				
		int current = 0;
		for(int i = 0; i < k; i++){
			for(int j = 0; j < n-1; j++){
				while( oranges[current] != -1){
					current++;
				}				
				oranges[current] = i;
			}
		}
		
		for(int i = 0; i < k; i++){
			for(int j = 0; j < oranges.length; j++ ){
				if( oranges[j] == i){
					System.out.print( j+1 + " ");
				}
			}
			System.out.println("");
		}
		
		
	}
	
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		new Solution().solve();
	}

}