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.*;
import java.util.*;
import java.lang.*;
 
public class Codeforces {
	PrintWriter out;
    StringTokenizer st;
    BufferedReader br;
 	
 	class Pair 
	{
	    int f;
	    int s;

	    public Pair(int t, int r) {
	       f = t;
	       s = r;
	    }
 	}
 	
	String ns() {
        while (st == null || !st.hasMoreElements()) {
 
            try {
                st = new StringTokenizer(br.readLine());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return st.nextToken();
    }
 
    String nextLine() throws Exception {
        String str = "";
        try {
            str = br.readLine();
        } catch (IOException e) {
            throw new Exception(e.toString());
        }
        return str;
    }
 
    int nextInt() {
        return Integer.parseInt(ns());
    }
 
    long nextLong() {
        return Long.parseLong(ns());
    }
 
    double nextDouble() {
        return Double.parseDouble(ns());
    }
	
	
	public static void main(String args[]) throws IOException {
		new Codeforces().run();
	}
 
	void run() throws IOException {
		br = new BufferedReader(new InputStreamReader(System.in));
        out = new PrintWriter(System.out);
        long s = System.currentTimeMillis();
		solve();
		out.flush();
		out.close();
	}
	

 	void solve() throws IOException{
		
		int n=nextInt();
		int k=nextInt();
		int a[]=new int[k];
		boolean vis[]=new boolean[901];
		
		for(int i=0;i<k;i++)
		{	
			a[i]=nextInt();
			vis[a[i]]=true;
		}
		
		int j=1;
		for(int i=0;i<k;i++)
		{
			out.print(a[i]+" ");
			int cnt=1;
			for(;j<=n*k&&cnt<n;j++)
			{
				if(vis[j]==false)
				{
					out.print(j+" ");
					vis[j]=true;
					cnt++;
				}
			}
			out.println();
		}
		
 	}
}